Author name code: bonnet
ADS astronomy entries on 2022-09-14
author:"Bonnet, Roger-Maurice"
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Title: Johannes Geiss (1927-2020)
Authors: Bonnet, Roger
Bibcode: 2020A&G....61b2.17B
Altcode:
Roger Bonnet remembers a researcher who pioneered the use of space
science in planetary, cometary and cosmic research, playing a vital
role in European space research.
Title: Maximize the impacts of space science
Authors: Wu, Ji; Bonnet, Roger
Bibcode: 2017Natur.551..435W
Altcode: 2017Natur.551..435.
Put research goals first when prioritizing and managing national and
international projects, urge Ji Wu and Roger Bonnet.
Title: Inventing a Space Mission: The Story of the Herschel Space
Observatory
Authors: Minier, Vincent; Bonnet, Roger-Maurice; Bontems, Vincent;
de Graauw, Thijs; Griffin, Matt; Helmich, Frank; Pilbratt, Göran;
Volonte, Sergio
Bibcode: 2017ism..book.....M
Altcode:
This book describes prominent technological achievements within
a very successful space science mission: the Herschel space
observatory. Focusing on the various processes of innovation it
offers an analysis and discussion of the social, technological
and scientific context of the mission that paved the way to its
development. It addresses the key question raised by these processes in
our modern society, i.e.: how knowledge management of innovation set
the conditions for inventing the future? In that respect the book is
based on a transdisciplinary analysis of the programmatic complexity of
Herschel, with inputs from space scientists, managers, philosophers,
and engineers. This book is addressed to decision makers, not only
in space science, but also in other industries and sciences using or
building large machines. It is also addressed to space engineers and
scientists as well as students in science and management.
Title: The Earth's Hydrological Cycle
Authors: Bengtsson, Lennart; Bonnet, R. -M.; Calisto, M.; Destouni,
G.; Gurney, R.; Johannessen, J.; Kerr, Y.; Lahoz, W. A.; Rast, M.
Bibcode: 2014ehc..book.....B
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No abstract at ADS
Title: The Science of Exoplanets and Their Systems
Authors: Lammer, Helmut; Blanc, Michel; Benz, Willy; Fridlund,
Malcolm; Foresto, Vincent Coudé du; Güdel, Manuel; Rauer, Heike;
Udry, Stephane; Bonnet, Roger-Maurice; Falanga, Maurizio; Charbonneau,
David; Helled, Ravit; Kley, Willy; Linsky, Jeffrey; Elkins-Tanton,
Linda T.; Alibert, Yann; Chassefière, Eric; Encrenaz, Therese;
Hatzes, Artie P.; Lin, Douglas; Liseau, Rene; Lorenzen, Winfried;
Raymond, Sean N.
Bibcode: 2013AsBio..13..793L
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No abstract at ADS
Title: 50 years of space science (Jean Dominique Cassini Medal
Lecture)
Authors: Bonnet, Roger-Maurice
Bibcode: 2013EGUGA..1513906B
Altcode:
The launch of Sputnik-1 triggered my fascination for space at the
age of 20. The past 50 years have allowed me to study the Sun with
sounding rockets and satellites, revealing the complexity of our
star, contributing to the understanding of its physics, and offering
surprising manifestations of its behavior and of its effects on
Earth. Building instruments for space astronomy, managing teams of
space scientists and engineers, led me to become the science director
of the European space agency between 1983 and 2001 where I formulated
and managed the Horizon 2000 program, which led Europe to occupy the
front row of world space science. The Jean Dominique Cassini Medal
Lecture offers me an opportunity, to describe the most spectacular
achievements of this long-term plan and to outline some basic principles
for reaching success, including the essential role of international
cooperation with shared partnership. The Lecture also identifies key
problems and controversial issues that space astronomy and exploration
will face in the 21st century.
Title: History of Venus Observations
Authors: Bonnet, Roger-Maurice; Grinspoon, David; Rossi, Angelo Pio
Bibcode: 2013tucv.book....7B
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Our image of Venus is that of a hellish, hot planet, permanently
covered by fast-moving clouds, with its surface inaccessible to any
Earth-based observer. But the perception and knowledge of our sister
planet has been very different in the recent and more remote past.
Title: Foreword
Authors: Bonnet, Roger-Maurice; Blanc, Michel
Bibcode: 2013qmgr.book....1B
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No abstract at ADS
Title: Towards Understanding the Climate of Venus
Authors: Bengtsson, Lennart; Bonnet, Roger-Maurice; Grinspoon, David;
Koumoutsaris, Symeon; Lebonnois, Sebastien; Titov, Dmitri
Bibcode: 2013tucv.book.....B
Altcode:
No abstract at ADS
Title: Cross-Calibration of Far UV Spectra of Solar System Objects
and the Heliosphere
Authors: Quémerais, Eric; Snow, Martin; Bonnet, Roger-Maurice
Bibcode: 2013ccfu.book.....Q
Altcode:
In this book we discuss the problems encountered for calibrating
space-borne instruments in the spectral range 50-300 nm. We also
discuss the level of accuracy that can be achieved, and review the
different sources of emissions that can be used in that range, i.e. the
interplanetary background, stars, and solar system bodies such as
planets, moons, and comets. As most of the work presented here is based
on comparisons with older datasets obtained by experiments that have
been calibrated independently, we also analyse the consistency between
existing datasets. Whenever possible, we suggest a correction factor
if an older dataset is in disagreement with a more recent one. For
example, a comparison of the interplanetary background data acquired
by the two ultraviolet (UV) spectrometers on Voyager 1 and Voyager
2 with models and other more recent datasets shows that it is indeed
necessary to derive new calibration factors for these two instruments.
Title: Foreword
Authors: Bonnet, Roger-Maurice; Blanc, Michel
Bibcode: 2013SSRv..174....1B
Altcode: 2012SSRv..tmp..104B
No abstract at ADS
Title: Observing and Modelling Earth's Energy Flows
Authors: Bengtsson, Lennart; Koumoutsaris, Symeon; Bonnet, Roger;
Allan, Richard P.; Fröhlich, Claus; Heintzenberg, Jost; Ingmann,
Paul; Kandel, Robert; Loeb, Norman G.; Soden, Brian; Trenberth, Kevin
Bibcode: 2012omee.book.....B
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No abstract at ADS
Title: The Earth's Cryosphere and Sea Level Change
Authors: Bengtsson, L.; Koumoutsaris, S.; Bonnet, R. -M.; Herland,
E. -A.; Huybrechts, P.; Johannessen, O. M.; Milne, G.; Oerlemans,
J.; Ohmura, A.; Ramstein, G.; Woodworth, P.
Bibcode: 2012ecsl.book.....B
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No abstract at ADS
Title: A Dark Age for Space Astronomy?
Authors: Bonnet, Roger-Maurice; Bleeker, Johan A. M.
Bibcode: 2011Sci...333..161B
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No abstract at ADS
Title: Foreword
Authors: Bonnet, Roger-Maurice; Blanc, Michel
Bibcode: 2010SSRv..153....1B
Altcode: 2010SSRv..tmp...95B
No abstract at ADS
Title: Foreword
Authors: Bonnet, Roger-Maurice; Blanc, Michel
Bibcode: 2010soss.book....1B
Altcode:
No abstract at ADS
Title: Concluding Remarks
Authors: Bonnet, Roger M.
Bibcode: 2010IAUS..269..183B
Altcode:
Let me first express my warmest acknowledgements to Cesare Barbieri for
having taken the initiative of convening this symposium. These two days
offered a unique opportunity to celebrate the scientific achievements
and the legacy of Galileo Galilei. It allowed not only celebrating
the scientist but also the philosopher and the human being. It was a
fantastic journey in the past, present and future exploration of our
universe and a fantastic retrospection into the Renaissance world which
no better city than Padova would be able to offer. During these two days
we could listen to a well balanced and well prepared set of excellent
papers and presentations. All participants should be congratulated for
their very active interactions during the discussions in the aula and
also during coffee and lunch breaks.
Title: Next 50 years of space research
Authors: Bonnet, R. -M.
Bibcode: 2009IAUS..257....3B
Altcode:
Forecasting the next 50 years of space research is a dangerous game
and a somewhat irresponsible action. Fortunately, the past 50 years
have evidenced what remains in the realm of realism and of the feasible
and what definitely belongs to the realm of utopia. Nevertheless those
who, like me today, take the risk of forecasting such a relatively
long time trend are sure of one thing: to be wrong!
Title: ESSC-ESF Position Paper-Science-Driven Scenario for Space
Exploration: Report from the European Space Sciences Committee (ESSC)
Authors: Worms, Jean-Claude; Lammer, Helmut; Barucci, Antonella; Beebe,
Reta; Bibring, Jean-Pierre; Blamont, Jacques; Blanc, Michel; Bonnet,
Roger; Brucato, John R.; Chassefière, Eric; Coradini, Angioletta;
Crawford, Ian; Ehrenfreund, Pascale; Falcke, Heino; Gerzer, Rupert;
Grady, Monica; Grande, Manuel; Haerendel, Gerhard; Horneck, Gerda;
Koch, Bernhard; Lobanov, Andreï; Lopez-Moreno, José J.; Marco,
Robert; Norsk, Peter; Rothery, Dave; Swings, Jean-Pierre; Tropea,
Cam; Ulamec, Stephan; Westall, Frances; Zarnecki, John
Bibcode: 2009AsBio...9...23W
Altcode:
In 2005 the then ESA Directorate for Human Spaceflight, Microgravity
and Exploration (D-HME) commissioned a study from the European Science
Foundation's (ESF) European Space Sciences Committee (ESSC) to examine
the science aspects of the Aurora Programme in preparation for the
December 2005 Ministerial Conference of ESA Member States, held in
Berlin. A first interim report was presented to ESA at the second
stakeholders meeting on 30 and 31 May 2005. A second draft report was
made available at the time of the final science stakeholders meeting
on 16 September 2005 in order for ESA to use its recommendations to
prepare the Executive proposal to the Ministerial Conference. The final
ESSC report on that activity came a few months after the Ministerial
Conference (June 2006) and attempted to capture some elements of the new
situation after Berlin, and in the context of the reduction in NASA's
budget that was taking place at that time; e.g., the postponement sine
die of the Mars Sample Return mission. At the time of this study,
ESSC made it clear to ESA that the timeline imposed prior to the
Berlin Conference had not allowed for a proper consultation of the
relevant science community and that this should be corrected in the
near future. In response to that recommendation, ESSC was asked again
in the summer of 2006 to initiate a broad consultation to define a
science-driven scenario for the Aurora Programme. This exercise ran
between October 2006 and May 2007. ESA provided the funding for staff
support, publication costs, and costs related to meetings of a Steering
Group, two meetings of a larger ad hoc group (7 and 8 December 2006
and 8 February 2007), and a final scientific workshop on 15 and 16
May 2007 in Athens. As a result of these meetings a draft report was
produced and examined by the Ad Hoc Group. Following their endorsement
of the report and its approval by the plenary meeting of the ESSC, the
draft report was externally refereed, as is now normal practice with
all ESSC-ESF reports, and amended accordingly. The Ad Hoc Group defined
overarching scientific goals for Europe's exploration programme, dubbed
"Emergence and co-evolution of life with its planetary environments,"
focusing on those targets that can ultimately be reached by humans,
i.e., Mars, the Moon, and Near Earth Objects. Mars was further
recognized as the focus of that programme, with Mars sample return as
the recognized primary goal; furthermore the report clearly states
that Europe should position itself as a major actor in defining and
leading Mars sample return missions. The report is reproduced in
this article. On 26 November 2008 the Ministers of ESA Member States
decided to give a high strategic priority to the robotic exploration
programme of Mars by funding the enhanced ExoMars mission component,
in line therefore with the recommendations from this ESSC-ESF report.
Title: Foreword
Authors: Bonnet, Roger-Maurice; Blanc, Michel
Bibcode: 2008SSRv..137....1B
Altcode: 2008SSRv..tmp..127B
No abstract at ADS
Title: Foreword
Authors: Bada, J. L.; Gomez-Elvira, J.; Javaux, E.; Rosing, M.;
Selsis, F.; Summons, R.; Bonnet, R. M.; Botta, O.
Bibcode: 2008SSRv..135....1B
Altcode: 2008SSRv..tmp...38B
No abstract at ADS
Title: Foreword
Authors: Bada, J. L.; Gomez-Elvira, J.; Javaux, E.; Rosing, M.;
Selsis, F.; Summons, R.; Bonnet, R. M.; Botta, O.
Bibcode: 2008sld..book....1B
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No abstract at ADS
Title: Surviving 1,000 Centuries
Authors: Bonnet, Roger-Maurice; Woltjer, Lodewijk
Bibcode: 2008soc..book.....B
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No abstract at ADS
Title: Surviving 1000 Centuries
Authors: Bonnet, Roger-Maurice; Woltjer, Lodewyk
Bibcode: 2008stc..book.....B
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No abstract at ADS
Title: Foreword
Authors: Bonnet, Roger-Maurice; Blanc, Michel
Bibcode: 2008pae..book....1B
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No abstract at ADS
Title: Message from the President
Authors: Bonnet, Roger-Maurice
Bibcode: 2007SpReT.170....3B
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No abstract at ADS
Title: Solar Variability and Planetary Climates
Authors: Calisesi, Y.; Bonnet, R. -M.; Gray, L.; Langen, J.;
Lockwood, M.
Bibcode: 2007svpc.book.....C
Altcode:
No abstract at ADS
Title: What Do We Know About the Climate of Terrestrial Planets?
Authors: Bonnet, R. -M.
Bibcode: 2006SSRv..125..431B
Altcode: 2006SSRv..tmp..107B
No abstract at ADS
Title: Assessing Solar Variability
Authors: Bonnet, R. -M.
Bibcode: 2006SSRv..125...17B
Altcode: 2006SSRv..tmp...96B
No abstract at ADS
Title: Message from the COSPAR president
Authors: Bonnet, Roger-Maurice
Bibcode: 2006CIBu..167....3B
Altcode: 2006SpReT.167....3B
No abstract at ADS
Title: Soho, Cluster, Double Star - the Sun and the Earth
Authors: Bonnet, R. M.
Bibcode: 2006ESASP.598E...1B
Altcode: 2006cds..sympE...1B
No abstract at ADS
Title: Hommage à un ami
Authors: Bonnet, R.
Bibcode: 2006via..conf..413B
Altcode:
No abstract at ADS
Title: The Beleinos cornerstone: the Sun, the star close to Earth
Authors: Appourchaux, T.; Auchère, F.; Bocchialini, K.; Bonnet,
R. M.; Gabriel, A.; Vial, J. -C.
Bibcode: 2005ESASP.588..389A
Altcode: 2005tssc.conf..389A
No abstract at ADS
Title: Foreword
Authors: Bonnet, R. -M.
Bibcode: 2005ISSIR...3D...5B
Altcode: 2005ESASR...3D...5B; 2005ssb..bookD...5B
No abstract at ADS
Title: Message from the president
Authors: Bonnet, Roger
Bibcode: 2005CIBu..163....3B
Altcode: 2005SpReT.163....3B
No abstract at ADS
Title: Recent Progress and Future Prospects in Solar Physics, and
Their Relevance for Planet Earth
Authors: Bonnet, Roger M.; Pauluhn, Anuschka
Bibcode: 2004SGeo...25..371B
Altcode:
Understanding our star, the Sun, is of fundamental interest for life
on Earth. In this paper, the status of knowledge in solar physics of
roughly two decades ago is summarised, and the most recent developments
in this very active field are shown, many of them achieved by means
of space based missions. The Sun Earth connection is described and,
finally, an outlook on future solar research is given.
Title: Message from the President
Authors: Bonnet, Roger-Maurice
Bibcode: 2004CIBu..161....4B
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No abstract at ADS
Title: René Pellat (1936-2003)
Authors: Bonnet, Roger-Maurice; Lavai, Guy; Luciani, Jean-François
Bibcode: 2004CIBu..160....3B
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No abstract at ADS
Title: The Fate of Solar Observations from Space
Authors: Bonnet, Roger M.
Bibcode: 2004IAUS..223..311B
Altcode: 2005IAUS..223..311B
In the past 10 years, observations from space have generated a genuine
revolution in our understanding of the Sun. Its interior is now
"observed" down to a few % of the solar radius, its internal dynamics,
its rotation and the large scale flows that are found to exist under
its "surface" are studied continuously for over nearly a complete
solar cycle. The mechanisms that underlie solar activity are better
understood as well as their effects on the heliosphere and on the
planets of the Solar System, in particular on the Earth.
Title: Cassini-Huygens in the European context
Authors: Bonnet, Roger-Maurice
Bibcode: 2004ESASP1278..201B
Altcode: 2004tide.conf..201B
When it was selected, the Huygens probe was only the second planetary
mission of ESA after the Giotto mission to Halley's comet. It has
been a key element of stability for the Cassini mission, which was
threatened with cancellation at several occasions. It has been a
technological challenge to develop. The Huygens probe was selected
in competition as a medium mission of the Horizon 2000 programme. It
is unlikely that it will have a successor in the present budgetary
context of ESA's science programme. It is also unlikely that it would
be selected today in the framework of a programme for the exploration
of the Solar System openly dedicated to the Moon and to Mars. Will
Huygens be the only attempt of Europe ever to adopt bold goals and
explore the Solar System beyond the orbit of Mars? The paper will also
discuss this aspect of the Cassini-Huygens mission.
Title: Opening address (5th IAA International Conference on Low-Cost
Planetary Missions)
Authors: Bonnet, Roger-Maurice
Bibcode: 2003ESASP.542D..15B
Altcode: 2003lcpm.confD..15B
No abstract at ADS
Title: The ESA Experience
Authors: Bonnet, R. M.
Bibcode: 2003ASSL..296...13B
Altcode: 2003osa4.book...13B
No abstract at ADS
Title: Message from the president
Authors: Bonnet, Roger-Maurice
Bibcode: 2003CIBu..158....3B
Altcode:
No abstract at ADS
Title: Message from the president
Authors: Bonnet, Roger-Maurice
Bibcode: 2003CIBu..157....1B
Altcode:
No abstract at ADS
Title: Concluding remarks (SOLMAG 2002)
Authors: Bonnet, Roger-Maurice
Bibcode: 2002ESASP.505..319B
Altcode: 2002solm.conf..319B; 2002IAUCo.188..319B
No abstract at ADS
Title: Space science and exploration in the 21st century
Authors: Bonnet, R. M.
Bibcode: 2001AnGeo..19.1201B
Altcode:
Available from http://www.copernicus.org/EGU/annales/19/1201.htm;
Title: Que l'Europe reste no. 2 pour la science spatiale!
Authors: Bonnet, R. M.; Pirard, Th.
Bibcode: 2001Ciel...63..175B
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No abstract at ADS
Title: The future of space science in the 21st century
Authors: Bonnet, R. M.
Bibcode: 2001Ap&SS.277..371B
Altcode:
Space Science helped the start of the open space race after the launch
of Sputnik-1 in 1957. Conversely, the use of space vehicles during
the cold war allowed the scientists to conduct many observations
and make discoveries which have dramatically changed our views of
our own Solar System and of the Universe. What will be the future of
this activity in the next century, with the disappearance of the cold
war justification and in the context of shrinking budgets? Is there
a future for space exploration? For what benefit and how will space
science programmes be conducted? Who will be the main players? Are
there limits to our ability to explore? The pioneers of space research
in the post-Sputnik-1 era, like J-L. Steinberg, had both an easier and
a more difficult time than space scientists of today. Nevertheless,
space science will only survive in the next century if it succeeds in
reaching the deep interest and motivation of society at large.
Title: Les premières expériences françaises de physique solaire
dans l'espace
Authors: Bonnet, Roger
Bibcode: 2001ESASP.472...59B
Altcode: 2001pesp.conf...59B
No abstract at ADS
Title: The Essential Role of Space Astronomy
Authors: Bonnet, R. M.
Bibcode: 2001qarr.conf..205B
Altcode:
It is a great honour for me to be here, addressing some of the most
talented and renowned astronomers of this century on the occasion of
his 70th birthday. Referring to Lo Woltjer, age has no meaning. It
is another honour to be the last to speak among so famous people and
to close what has been a fascinating symposium. My task is not made
easier by the title of this paper which sounds a little strange to
celebrate the former Director General of one of the most prestigious
Earth-bound astronomical observatories. However, the deep involvement
and pioneering contribution of Lo Woltjer in the interpretation of
the X-ray background, renders my talk a little easier.
Title: Un bicristal mince déformé sous l'effet d'un réseau
bipériodique de dislocations de misfitA thin bicrystal deformed by
a two period network of misfit dislocations
Authors: Bonnet, R.
Bibcode: 1999CRASB.327.1331B
Altcode:
The elastic field of a planar two-period network of misfit dislocations
parallel to the two free surfaces of a thin bimaterial is explicitly
determined from the assumption of an isotropic elasticity for each
crystal. A few calculations of normal stresses enable the elastic
field relaxation to be illustrated for CoSi 2/Si(111).
Title: Introductory Remarks
Authors: Bonnet, R. M.
Bibcode: 1999ESASP.446....5B
Altcode: 1999soho....8....5B
No abstract at ADS
Title: ESA's future plans in infrared and submillimetre astronomy
Authors: Bonnet, R. M.; Fridlund, C. V. M.; Pilbratt, G. L.; Tauber,
J. A.
Bibcode: 1999ESASP.427...95B
Altcode: 1999usis.conf...95B
This paper presents an overview of the European Space Agency's future
plans for infrared and submillimetre space astronomy. These plans
include: a contribution to the Next Generation Space Telescope (NGST);
the `Far InfraRed and Submillimetre Telescope' (FIRST), a multi-user
`observatory type' mission targeting the 80-670 μm wavelength range;
the Planck mission, designed to image the anisotropies of the Cosmic
Background Radiation Field over the whole sky, with unprecedented
sensitivity and angular resolution; and the Infrared Space
Interferometer (IRSI), a candidate for a future cornerstone mission.
Title: Le Point sur... Astronomie I
Authors: Encrenaz, T.; Capitaine, N.; Guinot, B.; de Lapparent-Gurriet,
V.; Combes, F.; Wiklind, T.; Breysacher, J.; Lucas, R.; Bonnet,
R. -M.; Beaulieu, J. -P.
Bibcode: 1999lpsa....1.....E
Altcode:
Le point sur Astronomie I and Le point sur Astronomie II are the
references of the Comptes Rendus de l'Académie des Sciences now
gathered in a book series. They consist of review articles in English
or French, requested by the Editor-in-Chief in charge of Astronomy in
the Comptes Rendus. Each volume presents: A collection of articles
written by specialists, the recent years' greatest results, and a
detailed bibliography
Title: The NGST Project within the ESA Science Programme
Authors: Bonnet, R.
Bibcode: 1998ESASP.429..155B
Altcode: 1998LIACo..34..155B; 1998ngst.conf..155B
No abstract at ADS
Title: Response
Authors: Bonnet, R. M.
Bibcode: 1998ESASP.431..195B
Altcode: 1998sslt.conf..195B
No abstract at ADS
Title: Unveiling the Secrets of the Sun
Authors: Bonnet, R. M.
Bibcode: 1998SSRv...85....1B
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No abstract at ADS
Title: Unveiling the Secrets of the Sun
Authors: Bonnet, R. M.
Bibcode: 1998sce..conf....1B
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No abstract at ADS
Title: Future ESA Projects
Authors: Bonnet, Roger M.
Bibcode: 1998LNP...507..281B
Altcode: 1998sspt.conf..281B
No abstract at ADS
Title: Introductory Remarks
Authors: Bonnet, R. M.
Bibcode: 1998AdSpR..21..263B
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No abstract at ADS
Title: The future of the European space research programmes
Authors: Bonnet, R.
Bibcode: 1997CRASB.325..671B
Altcode:
European space research carried out by ESA, the European Space Agency,
has enabled Europe to reclaim the leading positions it had conceded
to the USA. But an eventual return to the situation that prevailed
in the sixties, when European space research was totally dependent on
US planning and technologies is to be feared. Actually, Europe is only
spending a quarter of the amount NASA devotes to its space activities. A
new approach is required if there is to be any hope of preserving the
achievements of almost 40 years of efforts, which isstarting to bear
fruit. Halt the budget erosion, improve the , methods of management and
the execution of missions, start researches in 'high tech', avoid the
dispersal of technical and scientific activities, coordinate national
efforts with those of ESA: these necessary measures, taken as soon
as possible, would allow Europe to keep its rank of a scientific,
technological and cultural force.
Title: Mise en évidence de macles de déformation dans un
superalliage monogranulaire ' à base de nickel
Authors: Ati, A.; Lay, S.; Bonnet, R.
Bibcode: 1997CRASB.325..531A
Altcode:
An oriented single grain of a γ/γ' superalloy is deformed by dynamic
compression (12%, 20 °C) along [001]. Thin deformation twins are
observed for the first time in such a single grain using high resolution
electron microscopy. They appear to develop more easily in γ corridors
between γ' precipitates.
Title: The celebration session of the Hipparcos - Venice '97
symposium.
Authors: Bonnet, R. M.; Høg, E.; Bernacca, P. L.; Emiliani, L.;
Blaauw, A.; Turon, C.; Kovalevsky, J.; Lindegren, L.; Hassan, H.;
Bouffard, M.; Strim, B.; Heger, D.; Perryman, M. A. C.; Woltjer, L.
Bibcode: 1997ESASP.402.....B
Altcode: 1997hipp.conf.....B
No abstract at ADS
Title: Solution semi-analytique au problème de la dislocation-marche
Authors: Bonnet, R.
Bibcode: 1997CRASB.324..337B
Altcode:
A semi-analytic Fourier series analysis of the elastic field of a
dislocation placed along an interfacial ledge is proposed in the
framework of a planar deformation. The analysis is based on the
discretization of the limiting boundary conditions in stresses and
displacements along the interface. It leads to solution of a system of
linear equations expressing the elastic coupling between the two media.
Title: Overview of the soho mission
Authors: Bonnet, R. M.; Felici, F.
Bibcode: 1997AdSpR..20.2207B
Altcode:
The SOHO spacecraft was launched on 2 December 1995, some 8 years after
it started to be developed by European industry. Since 14 February
1996, SOHO is in a halo orbit around the Lagrangian point L1. It is
continuously in view of the Sun, allowing uninterrupted sequences
of observations of our star, a first in the development of solar
physics. Its payload composed of 12 instruments is operating very
successfully, providing for the first time a combined set of data on
the whole of the Sun from the deep interior to the solar wind at L1,
through the chromosphere and the corona. A brief history of the genesis
and development of SOHO will be presented, as well as a general overview
of the way the satellite and its payload perform. The most spectacular
and recent results achieved by the payload will be mentioned and the
future of the mission will be discussed.
Title: The scientific achievements of Ph. Delache
Authors: Bonnet, R. M.
Bibcode: 1997IAUS..181..221B
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No abstract at ADS
Title: The Fundamental Value of Space Science
Authors: Bonnet, Roger
Bibcode: 1997ESASP.420....5B
Altcode: 1997fps..conf....5B
No abstract at ADS
Title: C. de Jager, Europe, Space, and the Sun
Authors: Bonnet, R. M.
Bibcode: 1996SoPh..169..233B
Altcode:
The paper presents an overview of C. de Jager's career and his
achievements in space science and solar physics. His role as a European
space leader and as one of the founders of ESRO and ESA is outlined. The
international dimension of this outstanding scientist is illustrated
through personal memories and a long-lasting friendship.
Title: The history of thge SOHO mission.
Authors: Huber, M. C. E.; Bonnet, R. M.; Dale, D. C.; Arduini, M.;
Fröhlich, C.; Domingo, V.; Whitcomb, G.
Bibcode: 1996ESABu..86...25H
Altcode:
No abstract at ADS
Title: How might we approach a major lunar programme?
Authors: Bonnet, R. M.
Bibcode: 1996AdSpR..18k...7B
Altcode: 1996AdSpR..18....7B
No abstract at ADS
Title: Foreword
Authors: Bonnet, R. M.
Bibcode: 1995SoPh..162D..11B
Altcode:
No abstract at ADS
Title: Book-Review - International Cooperation in Space
Authors: Bonnet, R. M.; Manno, V.; Gibson, R.
Bibcode: 1995Natur.377..298B
Altcode:
No abstract at ADS
Title: Address by ESA's Director of Scientific Programmes
Authors: Bonnet, R. M.
Bibcode: 1995SSRv...72....3B
Altcode:
No abstract at ADS
Title: Rosetta - an ESA Mission
Authors: Bonnet, R. M.
Bibcode: 1995Sci...268..481B
Altcode:
No abstract at ADS
Title: Philippe Delache, 1937 - 13 October 1994.
Authors: Barlier, F.; Bonnet, R. M.; Fossat, E.; Leibacher, J.;
Frisch, U.
Bibcode: 1995JAF....47....2B
Altcode:
No abstract at ADS
Title: Taking the next step: The European Moon program
Authors: Bonnet, R. M.
Bibcode: 1995PlR....15a...8B
Altcode: 1995PlR....15R...8B
The European Moon program, which includes a manned lunar base, the
cultivation of the Moon's natural resources, and the exploration of
the Moon's unknown resources is discussed. Two projects are currently
being considered by ESA (European Space Agency): MORO (Moon Orbiting
Observatory); and LEDA (Lunar European Demonstration Approach). MORO
is a mission where a lunar orbiter studies all the different aspects
of the Moon's surface and investigates its interior. LEDA entails a
soft-land on the Moon's surface, with a possible payload of a lunar
rover, a soil-processing facility, and a robotic arm. It is hoped that
LEDA will provide the information necessary regarding the feasibility
of the establishment of a manned lunar base.
Title: European space science - In retrospect and in prospect
Authors: Bonnet, R. M.
Bibcode: 1995ESABu..81....6B
Altcode:
At a time when all space progams have to redefine their goals following
the end of the Cold War, and when some Member States are questioning
whether the (modest) pace that marked the first 35 years of European
space science should not be slower and the budget allocated to that
activity reduced, it is useful to look back and assess whether ESA,
and before it the European Space Research Organization (ESRO), have
been good for science and have played the roles as outlined in their
Conventions. It is also useful and enlightneing to assess whether ESA
has conducted its program efficiently.
Title: Book Review: Discovering the secrets of the sun By
R. Kippenhahn. Wiley, 1994, 262 pp. ISBN 0 471 94363 0
Authors: Bonnet, Roger M.
Bibcode: 1995P&SS...43..697B
Altcode:
No abstract at ADS
Title: Address by ESA's Director of Scientific Programmes
Authors: Bonnet, R. M.
Bibcode: 1995hlh..conf....3B
Altcode:
No abstract at ADS
Title: Why the Moon?
Authors: Bonnet, R. M.
Bibcode: 1994ESASP1170....9B
Altcode: 1994luna.work....9B
The main question today is not "why" but "how" to start a Moon
Programme. ESA proposes an approach which would allow all nations of
the world to cooperate, starting symbolically on 1 January 2000.
Title: SOHO and the solar community
Authors: Bonnet, R. M.
Bibcode: 1994SSRv...70....3B
Altcode:
No abstract at ADS
Title: International cooperation in space. The example of the European
Space Agency
Authors: Bonnet, Roger M.; Manno, Vittorio
Bibcode: 1994icse.book.....B
Altcode:
No abstract at ADS
Title: The Influence of G. Colombo on the ESA Programme
Authors: Bonnet, R.
Bibcode: 1994isra.conf...27B
Altcode:
No abstract at ADS
Title: Summary of the workshop.
Authors: Bonnet, R. M.
Bibcode: 1993ESASP1157..177B
Altcode:
No abstract at ADS
Title: Horizon 2000 and European national programmes.
Authors: Bonnet, R. M.
Bibcode: 1992eocm.rept...51B
Altcode:
A review on ESA's science program is presented. Five missions
still in orbit are outlined: IUE, Giotto, Hipparcos, Hubble Space
Telescope, and Ulysses. Objectives of the Horizon 2000 program
are described. Solar system exploration in Horizon 2000 concerns:
the SOHO (Solar and Heliospheric Observatory) and Cluster missions,
Cassini/Huygens to Saturn and Titan, and the Rosetta Comet Nucleus
Sample Return (CNSR). Astronomy in Horizon 2000 concerns ISO (Infrared
Space Observatory), the X-ray Multimirror Mission (XMM) and FIRST (Far
Infrared and Submillimeter Space Telescope). Medium sized missions of
Horizon 2000 include INTEGRAL (International Gamma Ray Astrophysical
Laboratory), MARSNET (a network of lander modules in Mars), and STEP
(Satellite Test of the (weak) Equivalent Principle). Small missions
include extension of Giotto and instruments to fly on Eureca, the
Columbus Space Station, and the Polar Platform.
Title: Messengers From Space
Authors: Bonnet, R. M.
Bibcode: 1991ICRC....5..152B
Altcode: 1991ICRC...22e.152B
No abstract at ADS
Title: The helioseismology experiment on the Phobos planetary
mission. Preliminary results
Authors: Frohlich, C.; Bonnet, R. M.; Bruns, A. V.; Vial, J. C.;
Delaboudiniere, J. P.; Domingo, V.; Kollath, Z.; Kotov, V. A.;
Rachkovskii, D. N.; Wehrli, Ch.; Toulain, T.; Shumko, S. M.
Bibcode: 1991BCrAO..83...18F
Altcode:
No abstract at ADS
Title: The helioseismological experiment at the Phobos interplanetary
station - Preliminary results
Authors: Froehlich, C.; Bonnet, R. M.; Bruns, A. V.; Vial, J. C.;
Delaboudiniere, J. P.; Domingo, V.; Kollath, Z.; Kotov, V. A.;
Rachkovskii, D. N.; Wehrli, Ch.
Bibcode: 1991IzKry..83...22F
Altcode:
Preliminary results obtained from IPHIR (Interplanetary Helioseismology
by Irradiance Measurements), a solar irradiance experiment on board
the Soviet planetary mission Phobos-2, are presented. During the
spacecraft's flight to Mars, the instrument gathered valuable data on
tiny variations of solar irradiance over the course of six months. The
data clearly show 5-min oscillations with relative amplitudes of about
10 exp -5 and with a well-defined pattern of discrete peaks in the
power spectrum. The data of the red channel (it exhibited the lowest
degradation of sensitivity over time) reveal remarkable temporal changes
of amplitudes of discrete peaks within a period range of about 5 min,
but with excellent frequency stability.
Title: Les sciences de l'univers à l'Agence Spatiale Européenne.
Authors: Bonnet, R. -M.
Bibcode: 1991CRASG...8..259B
Altcode:
No abstract at ADS
Title: ESA's `Horizon 2000' Programme
Authors: Bonnet, R. M.
Bibcode: 1990ESASP.310..167B
Altcode: 1990eaia.conf..167B
No abstract at ADS
Title: Solar Brightness Oscillations - PHOBOS-2 Observations
Authors: Bruns, A. V.; Bonnet, R.; Delaboudinier, J. P.; Frohlich,
C.; Shumko, S. M.
Bibcode: 1990SvAL...16..140B
Altcode:
No abstract at ADS
Title: Results of the Phobos-2 study of solar brightness oscillations
Authors: Bruns, A. V.; Bonnet, R.; Delaboudinier, J. P.; Frohlich,
C.; Shumko, S. M.
Bibcode: 1990PAZh...16..330B
Altcode:
Phobos-2 observations indicate that the variations in the power spectrum
of 5-min oscillations of the sun appear independently for each of the
modes and have the character of 4-5-hour amplitude bursts. In general,
the power spectrum lines reveal both quiet and active periods. The
quiet periods are characterized by a brightness burst amplitude of
(1.5-2) x 10 to the -7th and have a lifetime from about 10 hours to a
few days. The active spectrum consists of a single burst or a sequence
of bursts with an amplitude 30-50 times higher and lasting from a few
hours to one day.
Title: Observational cosmology within the ESA science programme.
Authors: Bonnet, R. M.
Bibcode: 1990NCimC..13....1B
Altcode:
Several missions of the Science Programme of ESA aim at tackling issues
of direct relevance to fundamental questions of modern cosmology. In
this paper one is following the arrow of time on a simplified space-time
diagram on which the means of observing back in the past the physical
phenomena or the structures which occur or appear at various epochs
in the evolution of the universe is identified. The author shows how
ESA through its science missions can contribute to these observations
in a unique way. The missions themselves are not described in detail
but the relevant bibliographical references are given.
Title: ESA plans for planetary exploration
Authors: Bonnet, R. M.
Bibcode: 1990AdSpR..10b.337B
Altcode: 1990AdSpR..10..337B
No abstract at ADS
Title: Telescope spatial : le miroir de l'univers.
Authors: Bonnet, R. -M.
Bibcode: 1990C&E...247...26B
Altcode:
No abstract at ADS
Title: Future Prospects of Helioseismology from Space
Authors: Bonnet, Roger M.
Bibcode: 1990ASSL..159..289B
Altcode: 1990IAUCo.121..289B; 1990insu.conf..289B
No abstract at ADS
Title: The rush to the moon. Act II: safeguarding the future.
Authors: Bonnet, R. -M.
Bibcode: 1989Rech...20.1566B
Altcode:
No abstract at ADS
Title: Space Future Forum
Authors: Sagdeev, R. Z.; Marchuk, G. I.; Raushenbakh, B. V.; de Jager,
C.; Lown, B.; Ortner, J.; Keller, S.; Bonnet, R.; Dakov, M.; Dunaev,
A. I.; Sagan, C.
Bibcode: 1989SSRv...50..395S
Altcode: 1989IAUCo.107..395S
No abstract at ADS
Title: Foreword
Authors: Bonnet, R. M.
Bibcode: 1989ESASP1111A...3B
Altcode: 1989hmpl.confA...3B
No abstract at ADS
Title: The Italian contribution to the programmes and activities
of ESA
Authors: Bonnet, R. M.
Bibcode: 1989MmSAI..60...11B
Altcode:
No abstract at ADS
Title: L'Europe scientifique spatiale est-elle achevée?
Authors: Bonnet, R. -M.
Bibcode: 1989JAF....34...25B
Altcode:
No abstract at ADS
Title: IPHIR: The helioseismology experiment on the PHOBOS mission.
Authors: Fröhlich, C.; Bonnet, R. M.; Bruns, A. V.; Delaboudinière,
J. P.; Domingo, V.; Kotov, V. A.; Kollath, Z.; Rashkovsky, D. N.;
Toutain, T.; Vial, J. C.; Wehrli, C.
Bibcode: 1988ESASP.286..359F
Altcode: 1988ssls.rept..359F
IPHIR (InterPlanetary Helioseismology by IRradiance measurements) is
a solar irradiance experiment on the USSR planetary mission PHOBOS to
Mars and its satellite Phobos. The experiment is a cooperative effort
of PMOD/WRC, LPSP, SSD/ESA, KrAO and CRIP. The sensor is a three channel
sunphotometer (SPM) which measures the solar spectral irradiance at 335,
500 and 865 nm with a precision of better than 1 ppm. A two axis solar
sensor (TASS) is added to monitor the moderate solar pointing of the
spacecraft. A microprocessor based data processing unit controls the
sensor operation, acquires the data, and performs the data compression
for the transmission at a mean rate of 1 bit/s. The two spacecrafts
have been launched on July 7th and 12th, 1988. The experiment on
PHOBOS I gathered data during 45 days before the S/C was lost, the
one on PHOBOS II is still operating. The data recovery is excellent
with virtually 100% coverage. Although the signal is disturbed by the
pointing of the spacecraft the results of a preliminary analysis in
the range of the 5-minutes oscillations demonstrate the improvement
achievable due to the fact that the time series is truly continuous
and the instrumental and sampling noise is very low.
Title: GOLF: Global Oscillations at Low Frequencies for the SOHO
mission
Authors: Gabriel, A. H.; Bocchia, R.; Bonnet, R. M.; Cesarsky, C.;
Christensen-Dalsgaard, J.; Dame, L.; Delache, Ph.; Deubner, F. L.;
Foing, B.; Fossat, E.
Bibcode: 1988sohi.rept...13G
Altcode:
The GOLF (global oscillations at low frequencies) SOHO (solar
heliospheric observatory) mission is described. It aims to study
the internal structure of the Sun by measuring the spectrum of free
global oscillations. GOLF will measure both p and g mode oscillations,
with emphasis on low order long period waves which penetrate the
solar core. The instrument aims to measure frequencies between 10-7
and 6 10-3 Hz, with a sensitivity of 1 mm/s. The method involves an
extension to space of the ground based technique for measuring the mean
line-of-sight velocity of the solar surface. A sodium vapor resonance
scattering filter is used in a longitudinal magnetic field to sample the
two wings of the solar absorption line. The use of a modulating magnetic
field provides a continuous internal calibration of the sensitivity. By
adding an additional rotating polarizer, measurements are also made
of the average solar magnetic field. Efforts are made to correct the
data for the spurious effects caused by solar magnetic active regions.
Title: Fundamental science and space science within the Horizon
2000 programme
Authors: Bonnet, Roger M.
Bibcode: 1988ESASP.281b..85B
Altcode: 1988duvb.conf...85B; 1988uvai....2...85B
The ESA solar system and astronomy programs are summarized. The
solar system program includes the Giotto Extended Mission; the
Ulysses solar polar mission; the solar terrestrial science program;
the Cassini Saturn/Titan probes; Vesta asteroid/comet mission; the
comet nucleus sample return mission; and possibly a Mars soil sample
return mission. The astronomy program includes IUE; HIPPARCOS; the
Hubble Space Telescope; the Infrared Space Observatory; the X-ray
Multi Mirror mission; the submillimeter spectroscopy mission; the
Gamma Ray Astronomy with Spectrometry and Positioning mission; Lyman;
and Quasat very long baseline interferometry mission.
Title: Fundamental science in ESA's space science programme.
Authors: Bonnet, R. M.
Bibcode: 1988ESASP.283..193B
Altcode: 1988ssfp.rept..193B; 1988ssfp.conf..193B
European Space Agency missions involving fundamental science are
presented. The dark mass problem and the origin of the X-ray background
is tackled with the high throughout X-ray spectroscopy mission XMM; the
direct measurement of the Hubble constant through the Sunyaev-Zel'dovich
effect combining observations from XMM and from the far infrared
submillimetric heterodyne spectroscopy mission; an independent check
of the existence of massive neutrinos and of the theory of general
relativity through helioseismology on board SOHO; and the evolution of
our solar system, galaxy, and maybe of the Universe through the analysis
of samples of pristine material extracted from the nucleus of a comet.
Title: En l'honneur de Jean-Claude Pecker.
Authors: Bonnet, R. M.
Bibcode: 1988JAF....33....2B
Altcode:
No abstract at ADS
Title: Jean-Claude Pecker s'abstrait...
Authors: Bonnet, R. M.
Bibcode: 1988LAstr.102..327B
Altcode:
No abstract at ADS
Title: Extreme ultra-violet filtergrams and X-ray spectroscopy of
active regions and flares from TRC/XSST rocket campaigns
Authors: Foing, B. H.; Martic, M.; Bonnet, R. M.; Bruner, M. E.;
Acton, L. W.; Brown, W. A.
Bibcode: 1988AdSpR...8k.153F
Altcode: 1988AdSpR...8..153F
Ultraviolet filtergrams and X ray spectra were taken by the joint
LPSP/Lockheed rocket experiment TRC/XSST during four international
campaigns involving also ground observations. XSST spectra in the
range 8 to 97A were obtained on the 13 July 1982 flare. From the EUV
filtergrams obtained by the TRC (Transition Region Camera), we could
derive calibrated fluxes in the 220nm and 160 nm continua, in the Ly
alpha and C IV lines, spanning a range of temperatures from medium
photosphere (5 000K), temperature minimum (4 200K), and transition
region (20 000 and 100 000 K). For active regions and a flare, the TRC
fluxes are compared to other data and to corresponding calculations
from semiempirical models. Finally, the scientific prospects of an
advanced TRC/XSST payload onboard future missions are discussed.
Title: Stellar Observations Within the ESA Science Program
Authors: Bonnet, R. M.
Bibcode: 1988ASIC..241..409B
Altcode: 1988felm.conf..409B
No abstract at ADS
Title: Abundances Anomaly in Accreting Magnetic White Dwarfs?
Authors: Bonnet, R.
Bibcode: 1988iue..prop.3303B
Altcode:
No abstract at ADS
Title: Introductory lecture
Authors: Bonnet, R. M.
Bibcode: 1987ESASP.268....7B
Altcode: 1987sass.conf....7B
The lecture intends to give the rational basis for the setting up of
the first ESA Long Term Plan in Space Science. It reviews the general
development in the field since the start of space activities and
attempts to forecast the possible directions of future activities.
Title: The Giotto Mission to Halley's Comet
Authors: Reinhard, R.; Bonnet, R. M.
Bibcode: 1987ESASP.268...31R
Altcode: 1987sass.conf...31R
The Giotto spacecraft encountered Halley's comet on 14 March 1986,
passing the nucleus at a distance of 600 km on the sunward side. Its
scientific payload comprising a camera, three mass spectrometers
for analysis of the neutrals, ions and dust, a photopolarimeter and
various plasma experiments worked flawlessly and returned a wealth
of data. Results on the nucleus, the composition of the cometary
atmosphere, and the interaction of the solar wind plasma with the
cometary ionosphere are described. Although damaged during the flyby,
Giotto may be retargeted using an Earth swingby maneuver to encounter
another comet.
Title: Some comments on the XIXth General Assembly of the
International Astronomical Union.
Authors: Bonnet, R. M.
Bibcode: 1987ApL....25..149B
Altcode: 1987ApL&C..25..149B
No abstract at ADS
Title: Structures fines chromosphériques: nouveaux résultats de
la caméra de la région de transition.
Authors: Foing, B. H.; Dame, L.; Vial, J. C.; Gouttebroze, P.; Martic,
M.; Bonnet, R. M.
Bibcode: 1987JAF....29...15F
Altcode:
No abstract at ADS
Title: ESA's medium and long-term plan in solar system exploration
Authors: Bonnet, R. M.
Bibcode: 1987AdSpR...7l.163B
Altcode: 1987AdSpR...7..163B
The various elements of ESA's strategy in planetary exploration are
reviewed. A brief description of the projects presently under study is
given and a possible strategy for ESA to participate in an international
mission to planet Mars is outlined.
Title: International cooperation in space within ESA
Authors: Bonnet, R. M.
Bibcode: 1987AdSpR...7l.227B
Altcode: 1987AdSpR...7..227B
The various areas and missions involving international cooperation
and coordination with ESA and its various space partners are
reviewed. Special mention is made of cooperation with NASA which has
been a privileged partner of ESA for many years. The past and future
activities conducted within the Inter Agency Consultative Group (IACG)
are also mentioned. It is shown that the apparent loss of independence
which may result from extensive international cooperation can be
corrected through the existence of a Long Term Plan.
Title: Future Prospects of Stellar and Solar Physics from Space
Authors: Bonnet, R. -M.
Bibcode: 1987LNP...292..187B
Altcode: 1987ssp..conf..187B
The unbeatable advantage of space techniques in the investigation of
solar and stellar physics are briefly reviewed, and a table listing
most of the missions and facilities which are foreseen to contribute to
the field in the next 15 years or so is presented. Different scientific
areas for which space techniques will provide substantial advance are
reviewed. Some specific missions are described.
Title: Observations by the Halley multicolor camera
Authors: Keller, H. U.; Arpigny, C.; Barbieri, C.; Bonnet, R. M.;
Cazes, S.; Coradini, M.; Cosmovici, C. B.; Curdt, W.; Delamere, W. A.;
Huebner, W. F.
Bibcode: 1986ehac....2..347K
Altcode:
The first image of comet Halley was taken by the multicolor camera (HMC)
on 9 March from a distance of 23.6 million km. During the encounter
HMC was switched on at 4:12 hr before closest approach CA. It took
its first image at 3:06 h before CA. Overall 2043 images were taken in
single sensor mode. The inner coma was observed using all 11 filters and
polarizers. The transmission curves of the filters (except polarizers)
are shown together with the sensitivity of the camera. At 6 min
before CA HMC switched to multiple sensor mode taking 4 images almost
simultaneously through the clear, blue, and red wideband filters. Only
2% of all data taken could be transmitted in 69 image sets. The last
image showing details of the nuclear surface was taken from a slant
distance of 1740 km and has a nominal resolution of 39 m per pixel.
Title: Observations by the Halley Multicolour Camera
Authors: Keller, H. U.; Arpigny, C.; Barbiert, C.; Bonnet, R. M.;
Cazes, S.; Cordini, M.; Cosmovici, C. B.; Curdt, W.; Delamere, W. A.;
Huebner, W. F.; Hughes, D. W.; Jamar, C.; Kramm, R.; Malaise, D.;
Reitsema, H.; Schmidt, H. U.; Schmidt, K.; Schmidt, W. K. H.; Seige,
P.; Whipple, F. L.; Wilhelm, K.
Bibcode: 1986ESASP.250b.347K
Altcode: 1986ehc2.conf..347K
The Halley Multicolour Camera (HMC) was the only remote sensing
instrument on board the Giotto spacecraft. HMC operated successfully up
to the moment when a power surge on the spacecraft impaired operations
of several instruments. The very last image frame of HMC was transmitted
from about 12 s before closest approach. The first image of comet
Halley was taken by HMC on 9 March. The observations of the HMC have
consolidated our perception of the nature of comets.
Title: Emission of Lyman-α radiation by solar coronal
loops. II. Filtergram analysis.
Authors: Tsiropoula, G.; Alissandrakis, C.; Bonnet, R. M.; Gouttebroze,
P.
Bibcode: 1986A&A...167..351T
Altcode:
The authors study active region loops, observed on Lα high resolution
filtergrams obtained with a rocket borne instrument. Some formulae or
diagrams are given for the computations of Lα and Hα intensities
emitted by homogeneous loop models. The dimensions and emitted
intensities of the observed loops being known, the authors determine
the variations of temperature, pressure and density inside these
objects under the assumption of constant temperature and hydrostatic
equilibrium. The influence of temperature gradient and mass flow
on the results is discussed, and an alternative model with radial
temperature increase is envisaged. The case of an isolated loop with
a larger diameter is also discussed.
Title: New high-resolution rocket-ultraviolet filtergrams of the
solar disc
Authors: Foing, B.; Bonnet, R. -M.; Bruner, M.
Bibcode: 1986A&A...162..292F
Altcode:
A rocket-borne solar ultraviolet telescope named Transition Region
Camera was launched successfully for the third time on 13th July
1982. High quality calibrated photographic images of the sun were
obtained at Lyman alpha and in the continuum at 160 nm and 220 nm. The
angular resolution achieved is better than one arc second. A flare,
active regions, sunspots, the 8 Mm mesostructure, the chromospheric
network, bright UV grains and coronal loops were observed during the
flight. The results are presented and the evolution with height in
the solar atmosphere of the various structures observed is followed
from one wavelength to the other, showing distinct differences. The
value of the field's intensity of magnetic flux tubes is deduced from
the observations.
Title: European Space Telescope
Authors: Bonnet, R. M.
Bibcode: 1986Sci...232R1486B
Altcode:
No abstract at ADS
Title: European Space Telescope
Authors: Bonnet, R. M.; Rieke, G.
Bibcode: 1986Sci...232.1486B
Altcode:
No abstract at ADS
Title: First Halley Multicolour Camera imaging results from Giotto
Authors: Keller, H. U.; Arpigny, C.; Barbieri, C.; Bonnet, R. M.;
Cazes, S.; Coradini, M.; Cosmovici, C. B.; Delamere, W. A.; Huebner,
W. F.; Hughes, D. W.; Jamar, C.; Malaise, D.; Reitsema, H. J.; Schmidt,
H. U.; Schmidt, W. K. H.; Seige, P.; Whipple, F. L.; Wilhelm, K.
Bibcode: 1986Natur.321..320K
Altcode:
The first imaging results from the Halley Multicolour Camera (HMC)
during the Giotto fly-by of comet Halley provide images centred on
the brightest part of the inner coma which show the silhouette of
a large, solid and irregularly shaped cometary nucleus and jet-like
dust activity visible in reflected sunlight. A first assessment of the
data yields information on the dimensions and shape of the nucleus and
dust emission activity. The nucleus is at least 15 km long and ~10 km
wide; its geometrical albedo is very low (<4%). Only minor parts
of the surface are active, most of it beirig covered by non-volatile
material. Dust jets dominate the inner coma and are restricted to the
sub-solar hemisphere. Preliminary interpretations of these observations
are presented. The parameters of the fly-by trajectory relative to
the nucleus are given.
Title: The Giotto Halley multicolor camera
Authors: Schmidt, W. K. H.; Keller, H. U.; Wilhelm, K.; Arpigny,
C.; Barbieri, C.; Biermann, L.; Bonnet, R. M.; Cazes, S.; Cosmovici,
C. B.; Delamere, W. A.
Bibcode: 1986gmis.rept..149S
Altcode:
The Halley Multicolor Camera (HMC) is a Ritchey-Chretien type
Cassegrain telescope (1000 mm focal length) with CCD imagers in the
focal plane. It is suspended in a revolving mount so that the center
of its field of view can be moved freely in a half plane that contains
the spin axis of the spacecraft. Together with the spinning motion
of the spacecraft, this mobility enables the HMC to image any part of
the whole 4 pi solid angle of the sky. The line-scan imaging technique
uses the spacecraft/s spin for one dimension and the length of the line
for the other dimension of the image. Four line sensors with filters
of different color bands take images almost simultaneously. Onboard
electronics controlled by three microprocessors operate the camera
almost autonomously. The image of the comet will be sought at the
beginning of the encounter operations. Having found it, the camera
will switch to the imaging mode. The contents of the images are to be
telemetered to ground in sections and at the same time used onboard
to update the parameters that describe the spacecraft/s trajectory
relative to the cometary nucleus. With this information, the HMC/s
field of view will be able to track the center of the comet/s image.
Title: A Comparison of Photospheric Electric Current and Ultraviolet
and X-Ray Emission in a Solar Active Region
Authors: Haisch, B. M.; Bruner, M. E.; Hagyard, M. J.; Bonnet, R. M.
Bibcode: 1986ApJ...300..428H
Altcode:
This paper presents an extensive set of coordinated observations
of a solar active region, taking into account spectroheliograms
obtained with the aid of the Solar Maximum Mission (SMM) Ultraviolet
Spectrometer Polarimeter (UVSP) instrument, SMM soft X-ray polychromator
(XRP) raster maps, and high spatial resolution ultraviolet images of
the sun in Lyman-alpha and in the 1600 A continuum. These data span
together the upper solar atmosphere from the temperature minimum to
the corona. The data are compared to maps of the inferred photospheric
electric current derived from the Marshall Space Flight Center (MSFC)
vector magnetograph observations. Some empirical correlation is found
between regions of inferred electric current density and the brightest
features in the ultraviolet continuum and to a lesser extent those
seen in Lyman-alpha within an active region.
Title: XSST/TRC rocket observations of 13 July 1982 flare.
Authors: Foing, B. H.; Bonnet, R. M.; Dame, L.; Bruner, M.; Acton,
L. W.; Brown, W. A.
Bibcode: 1986lasf.conf..319F
Altcode: 1986lasf.symp..319F
The authors analyse the UV filtergrams of the 13 July
1982 solar flare, taken by the Transition Region Camera,
during the third flight of the joint Lockheed/LPSP rocket
experiment XSST/TRC. From the calibrated intensities of the flare
components, they estimate directly the Lyα line flux (from 230 to
650×103erg cm-2s-1sr-1),
differentially the C IV line flux (from 30 to 130×103erg
cm-2s-1sr-1), and the excess of 160 nm
continuum temperature brightness (from 100 to 250K) over the underlying
plage. No detectable variation is observed in the 220-nm channel
formed in the medium photosphere. These values are small compared to
other observed or calculated equivalent quantities from Machado model
of flare F1. The authors estimate the corresponding power required to
heat the temperature minimum accordingly over the 1200 Mm2
area, to be 3.6×1025erg s-1 for this small
X-ray C6 flare, 7 minutes after the ground based observed flare maximum.
Title: New ultra-violet filtergrams and results from the transition
region camera rocket experiment
Authors: Damé, L.; Foing, B. H.; Martic, M.; Bruner, M.; Brown, W.;
Decaudin, M.; Bonnet, R. M.
Bibcode: 1986AdSpR...6h.273D
Altcode: 1986AdSpR...6..273D
The rocket-borne solar ultra-violet telescope named Transition Region
Camera (T.R.C.) was launched successfully for the fourth time on
25th october 1985. Calibrated photographic images of the sun were
obtained at Lyman alpha and in two adjacent bands at 156 nm and 169
nm. The angular resolution achieved was equivalent to 0.7 arcsec. Fine
structures in Lyman alpha were observed in the network and above
supergranular cells. From the 156 nm filtergram (including a strong C
IV contribution) and the 169 nm filtergram, we study the differential
contribution of the C IV lines and of the continuum emission, from
the quiet sun, an active region and at the limb.
Title: The Giotto Halley Multicolour Camera.
Authors: Schmidt, W. K. H.; Keller, H. U.; Wilhelm, K.; Arpigny, C.;
Barbieri, C.; Biermann, L.; Bonnet, R. M.; Cazes, S.; Cosmovici,
C. B.; Delamere, W. A.; Huebner, W. F.; Hughes, D. W.; Jamar, C.;
Malaise, D.; Reitsema, H.; Seige, P.; Whipple, F. L.
Bibcode: 1986ESASP1070..149S
Altcode:
In recent decades, Whipple's "dirty snowball" picture of the cometary
nucleus has become widely, but not universally accepted. Proof
of the nucleus' existence and study of its properties require
pictures in various colour bands, preferably together with other
information. Acquisition of these pictures is the task of Halley
Multicolour Camera (HMC), which is described in detail.
Title: Astronomie Flammarion, Vols. 1+2.
Authors: Rösch, J.; Wlérick, G.; Guibert, J.; Bonnet, R.; Vedrenne,
G.; Celnikier, L.; Morando, B.; Boischot, A.; Brahic, A.; Kandel,
R.; Dumont, S.; Praderie, F.; Magnan, C.; Gerbaldi, M.; Zahn, J. -P.;
Gouguenheim, L.; Bottinelli, L.; Heidmann, N.; Heidmann, J.; Véron,
P.; Nottale, L.; Pecker, J. -C.; Golay, M.
Bibcode: 1985afv..book.....R
Altcode:
Contents: L'astronomie à l'œil nu (J. Rösch). L'astronomie
optique; de Galilée à la fin du XXe siècle
(G. Wlérick). Télescopes et lunettes du XXe siècle
(G. Wlérick). La radioastronomie (J. Guibert). L'astronomie
spatiale (R. Bonnet). L'astronomie des hautes énergies
(G. Vedrenne). L'exploration in situ dumilieu astronomique
(L. Celnikier). Le système solaire: généralités (B. Morando). Les
planètes telluriques (L. Celnikier). Astéroïdes, comètes et
météorites (L. Celnikier). Jupiter (A. Boischot). Le monde de Saturne
(A. Brahic). Les confins du système solaire (Uranus, Neptune et Pluton)
(A. Brahic). Le Soleil, les planètes, la Terre (R. Kandel). Le Soleil,
étoile typique (S. Dumont). Les spectres stellaires: la connaissance
des étoiles (F. Praderie). L'interaction des étoiles et du milieu
environnant (C. Magnan). La Galaxie: étoiles et matière interstellaire
(M. Gerbaldi). L'évolution des étoiles (J.-P. Zahn). Les facteurs de
l'évolution galactique (L. Gouguenheim). Forme et classification des
galaxies (L. Bottinelli, N. Heidmann). Amas et superamas de galaxies
(J. Heidmann). Les quasars (P. Véron). Évolution des galaxies
(L. Gouguenheim). Les faits cosmologiques (L. Bottinelli). La cosmologie
de la grandeexplosion (L. Nottale). Le débat cosmologique (L. Nottale).
Title: X-ray, Ultraviolet, Optical and Magnetic Structure in and
near an Active Region
Authors: Haisch, B. M.; Tarbell, T. D.; Bruner, M. E.; Acton, L. W.;
Bonnet, R. M.; Hagyard, M. J.
Bibcode: 1984BAAS...16Q1002H
Altcode:
No abstract at ADS
Title: Characteristic structures of the solar disc observed on rocket
UV filtergrams
Authors: Foing, B.; Bonnet, R. M.
Bibcode: 1984A&A...136..133F
Altcode:
The high resolution ultraviolet filtergrams obtained with the Transition
Region Camera (a 10 cm aperture telescope equipped with broad-band
filters and a film cassette) have been statistically analyzed, using
two different methods of Fourier filtering (the Optical and the
Numerical Fourier Analysis) and autocorrelation of one-dimensional
scans of network and active disk areas. The statistical properties
and average dimensions of the structures characteristic of ultraviolet
solar filtergrams near temperature minimum are deduced. The dimensions
of the ultraviolet cell grains characteristic of the 160 nm pictures
are found to be of the order of 0.6 Mm (i.e., 0.9 arcsec with an
interdistance 1.4 Mm). The network and plage elements are brighter
and broader (about 1.0 Mm). An intermediate scale of about 8 Mm is
found in the cells which is discussed in terms of the velocity field
associated with the 3 min chromospheric oscillations. A scale of about
14 Mm is found in plage areas, which is related to the structure of
the network in active regions.
Title: On the origin of the discrete character of the solar disk
brightness in the 160 nanometer continuum
Authors: Foing, B.; Bonnet, R. M.
Bibcode: 1984ApJ...279..848F
Altcode:
The performance of the Transition Region Camera (TRC) is
evaluated with respect to spatial resolution in order to arrive
at a more refined description of the 160 nm features. The origins
of the ultraviolet-bright grains observed in the interior of the
supergranulation cells and of the bright elements that delineate the
network are investigated. It is believed that the network elements
and the cell grains have different origins. The network elements
may appear bright as a consequence of the Wilson effect at the top
of concentrated magnetic flux tubes. The magnetic field intensity
deduced on the assumption that the tubes are thermalized with their
surroundings is 120 G, which corresponds to an intensity of 1.5 kG at
the photospheric level. The cell grains cannot be of magnetic origin
because the magnetic field intensity they would require would be too
high. It is suggested that they are the trace of a local dissipation
of energy contained in periodic motions.
Title: Magnetic Flux Tubes and Local Heating in the Temperature
Minimum Region
Authors: Foing, B. H.; Bonnet, R. M.
Bibcode: 1984ssdp.conf..291F
Altcode:
The photometry and statistical analysis of 160 nm solar filtergrams
obtained by the Transition Region Camera, indicate that the solar
surface radiates at the temperature minimum a substantial portion
from features at the arcsec scale both in the network and inside
the supergranular cells. The authors investigate the origins of the
ultraviolet bright features in the cells and the network elements.
Title: The Transition Region Camera Experiment: High Resolution
Ultra-Violet Filtergrams of the Sun
Authors: Foing, B. H.; Bonnet, R. M.; Acton, L. W.; Brown, W. A.;
Bruner, M.; Decandim, M.
Bibcode: 1984ssdp.conf...99F
Altcode:
Three series of high resolution UV pictures of the Sun have been
obtained during the three flights of the Transition Region Camera
which took place on July 3, 1979, September 23, 1980 and July 13,
1982. These pictures reveal many new structures which were never
seen before on Ly alpha spectro-heliograms and on UV pictures of the
temperature minimum region. The scientific objectives, instrumentation,
flight conditions and preliminary results are described.
Title: On the possible use of deep U.V. photoresists correctors to
obtain the ultimate U.V. resolution of space borne telescopes.
Authors: Dame, L.; Bonnet, R. M.; Artzner, G. E.
Bibcode: 1984SPIE..445..318D
Altcode:
Large space-borne telescopes are limited in their ultraviolet resolution
by their large and medium scale (20 - 30 cm) surface irregularities
(ripples). The authors present the principle, instrumentation and
first results of a new interferometric method using a Michelson-Twyman
configuration (diverging light beams) that allows to engrave on
deep U.V. photoresists a phase compensating plate which permit to
revocer, partly or entirely, the diffraction limited resolution of the
telescope. The corrector that they obtain is a phase compensating plate
in reflection with highs and lows on its surface perfectly conjugated
in negative, with the primary mirror surface irregularities.
Title: Results from the transition region camera
Authors: Foing, B. H.; Bonnet, R. M.
Bibcode: 1984AdSpR...4h..43F
Altcode: 1984AdSpR...4...43F
Three series of high resolution ultra-violet pictures of the Sun
have been obtained during the three flights of rocket experiment
T.R.C. (Transition Region Camera) which took place on 3 July 1979,
23 September 1980 and 13 July 1982. These pictures reveal many
structures in Ly alpha and ultraviolet continua at 160 nm and 220
nm. The scientific objectives, instrumentation, flight conditions
and campaigns of simultaneous observations are described. The
contribution of T.R.C. to solar physics is discussed in the framework
of chromospheric multicomponent models, magnetic flux tubes, local
heating and periodic structures in the chromosphere.
Title: Helioseismology in the Future
Authors: Bonnet, R. M.
Bibcode: 1983SoPh...82..487B
Altcode: 1983IAUCo..66..487B
We review the observables of helioseismology that can contribute to
our knowledge of the physical conditions in the solar interior. We
discuss the limitations which presently prevent helioseismology from
reaching its ultimate goal. We finally present a list of projects which
either are already underway or that are planned for the near future,
and we conclude by showing the crucial role that space observations
may play in the future.
Title: Magnetic flux tubes and local heating in the solar temperature
minimum region.
Authors: Foing, B. H.; Bonnet, R. M.; Bruner, M. E.; Acton, L. W.
Bibcode: 1983BAAS...15..620F
Altcode:
No abstract at ADS
Title: Solar-terrestrial influence
Authors: Bonnet, R. M.
Bibcode: 1983uias.book...37B
Altcode:
Solar phenomena are examined to assess the extent of knowledge of
the effect of the sun on the earth. The earth is gravitationally
coupled to the sun, imbedded in the solar corona and thereby subject
to particle bombardment and the influence of the solar magnetic field,
and is directly illuminated by the sun at a rate of 1.367 kW/sq m. The
coronal density is 10 particles/cu cm at the earth's distance from the
sun, and the solar magnetic field is 1/10,000 what it is at the solar
surface. Particle bombardment from the sun causes auroral displays,
while other particles are diverted by the terrestrial magnetosphere and
form a bow shock. Incoming solar protons dissociate NO in the upper
atmosphere and form ozone. The ability of the earth's atmosphere at
any time to absorb the total incoming solar radiation is a determining
factor in the heating of the atmosphere. The heated atmosphere expands
and may slow down satellites in LEO, while no precise modelling
has yet been accomplished for the relationship between heating and
climatic variations.
Title: Solar-Terrestrial Influence
Authors: Bonnet, R. M.
Bibcode: 1983utu..conf...37B
Altcode:
Contents: Introduction. The solar influence. The consequences for the
earth of being embedded in the outer solar corona. The interaction
between solar radiation and the atmosphere of our planet. Have the
solar variations any influence on our climate? Conclusion.
Title: Rocket photographs of fine structure and wave patterns in
the solar temperature minimum
Authors: Bonnet, R. M.; Decaudin, M.; Foing, B.; Bruner, M.; Acton,
L. W.; Brown, W. A.
Bibcode: 1982A&A...111..125B
Altcode:
A new series of high resolution pictures of the sun has been obtained
during the second flight of the Transition Region Camera which occurred
on September 23, 1980. The qualitative analysis of the results indicates
that a substantial portion of the solar surface at the temperature
minimum radiates in non-magnetic regions and from features below 1
arcsec in size. Wave patterns are observed on the 160 nm temperature
minimum pictures. They are absent on the Lyman alpha pictures. Their
physical characteristics are compatible with those of gravitational
and acoustic waves generated by exploding granules.
Title: Book-Review - Solar Phenomena in Stars and Stellar Systems -
Proceedings of the NATO Advanced Study Institute Held in Bonas France
on 1980AUG25 - 1980SEP5
Authors: Bonnet, R. M.; Dupree, A. K.; Pagel, B.
Bibcode: 1982Obs...102...95B
Altcode:
No abstract at ADS
Title: Density and temperature determination of neutral hydrogen in
coronal structures
Authors: Bonnet, R. M.; Tsiropoula, G.
Bibcode: 1982SoPh...75..139B
Altcode:
High-resolution filtergrams in Lα have been obtained with a rocket
borne instrument and evidence several loop shaped structures which
can be seen as absorption features over the solar surface. The optical
thickness of these coronal structures is measured with respect to nearby
unabsorbed disk features. Their shape and dimension being known from
the images, the determination of the neutral hydrogen temperature and
density is possible. It is found that temperatures below 105
K and densities of a few 104 hydrogen atoms cm−3
are compatible with the opacities observed in the structures.
Title: Book-Review - Solar Phenomena in Stars and Stellar Systems
Authors: Bonnet, R. M.; Dupree, A. K.; Zwann, C.
Bibcode: 1982SSRv...33..461B
Altcode:
No abstract at ADS
Title: Book-Review - Solar Phenomena in Stars and Stellar Systems
Authors: Bonnet, R. M.; Dupree, A. K.
Bibcode: 1982S&T....63..375B
Altcode:
No abstract at ADS
Title: Recent developments in ion mass spectrometers in the energy
range below 100 keV
Authors: Bonnet, R. M.
Bibcode: 1982AdSpR...2d....B
Altcode: 1982AdSpR...2Q....B
The recognition that heavy ions often have similar or higher abundance
than protons in space plasmas and the fact that ions with masses
and/or charges larger than unity are ideally suited to test theories on
origin, transport, acceleration, and loss of these plasmas led to the
development of new and more sophisticated mass spectrometers during
the last decade. The characteristics of several state-of-the-art
instruments which have been flown or selected for missions will be
discussed and aims for future developments will be given.
Title: Book-Review - Solar Phenomena in Stars and Stellar Systems
Authors: Bonnet, R. M.; Dupree, A. K.
Bibcode: 1981JBAA...92...50B
Altcode:
No abstract at ADS
Title: The Role of Space Techniques in the Understanding of Solar
Variability
Authors: Bonnet, R. M.
Bibcode: 1981SoPh...74..485B
Altcode:
The unique advantages of space observations are recalled, and the
difficulties in performing reliable measurements of solar variability
from space are stressed. The elements of a strategy aimed at improving
the accuracy of absolute as well as relative measurements are given.
Title: Book-Review - Phenomena in Stars and Stellar Systems
Authors: Bonnet, R. M.; Dupree, A. K.; Howard, R.
Bibcode: 1981Sci...214..902B
Altcode:
No abstract at ADS
Title: Cross-Identification Tables Cod-Cpd
Authors: Bonnet, R.; Ochsenbein, F.
Bibcode: 1981BICDS..21...51B
Altcode:
No abstract at ADS
Title: The Contribution of OSO-8 to Our Knowledge of the Chromosphere
and Transition Region
Authors: Bonnet, R. M.
Bibcode: 1981SSRv...29..131B
Altcode:
This review deals with the pointed instrumentation placed onboard the
NASA Orbiting Solar Observatory No. 8 which was successfully launched
in June 1975 and operated continuously for more than 3 years. In the
first part of the review a brief description of the instrumentation
and of its capabilities is given together with an appreciation of
how it performed into orbit. In particular, the loss in photometric
sensitivity which affected the pointed instruments is analyzed, and
its possible origins are discussed. The most important scientific
achievements are then reviewed in detail. The high spectral resolution
of the OSO-8 pointed instruments allowed to make a real break through
in the investigation of the heating mechanisms of the chromosphere
and corona, by showing that the energy contained in the 150 300 s
oscillations is 2 to 3 orders of magnitude too low to accomodate the
radiative losses of these layers. Line profile and power spectrum
analysis, together with the variation over the disk and in height
of the non thermal velocities lend more support to the concept of
a chromosphere and transition region being magnetically heated. The
dynamics of the upper solar atmosphere has been studied at altitudes
never achieved before. The original idea of modelling chromospheric
structures through the exact representation of simultaneous Lα, Mg
ii and Ca ii profiles looks today a bit naive after OSO-8 has shown
that the detailed interpretation of Lα in particular is impossible
in the assumption of a model in hydrostatic equilibrium. The physical
structure of sunspots, prominences and of a few active regions has been
investigated through the analysis of the profiles observed for the first
time in these features. After OSO-8 our view of a homogeneous static
chromosphere in hydrostatic equilibrium nearly completely collapses,
and the answer to still unanswered questions is awaiting the advent
of such new instruments as the SOT and the GRIST which will possess
the required sub arc second capability.
Title: High Resolution UV Filtergrams of the Sun
Authors: Foing, B.; Bonnet, R. M.; Bruner, E. C.; Action, L. W.
Bibcode: 1981BAAS...13..911F
Altcode:
No abstract at ADS
Title: Astronomie
Authors: Bonnet, Roger-M.
Bibcode: 1981astr.book.....B
Altcode: 1981QB43.2.A87.....
No abstract at ADS
Title: Solar phenomena in stars and stellar systems
Authors: Bonnet, R. M.; Dupree, A. K.
Bibcode: 1981ASIC...68.....B
Altcode: 1981spss.conf.....B
Papers are presented concerning astrophysical phenomena which can be
studied extensively on the sun, particularly as regards the physics
of stellar interiors, the relation of chromospheres and coronae
to convective phenomena, and stellar and solar variability. Specific
topics include the physics of photospheric flux tubes, solar and stellar
oscillations, evidence for stellar chromospheres and coronae, energy
balance in stellar and solar chromospheres and coronae, solar magnetic
heating, mass loss in late-type stars, long-term stellar and solar
variability, the implications of starspots, the magnetohydrodynamic
instabilities that may be responsible for solar flares, and stellar
analogs of solar microwave phenomena.
Title: A Halley Multicolour Camera
Authors: Keller, H. U.; Arpigny, C.; Barbieri, C.; Benvenuti, P.;
Biermann, L.; Bonnet, R. M.; Cazes, S.; Colombo, G.; Cosmovici,
C. B.; Delamere, W. A.; Heubner, W. F.; Hughes, D. W.; Hunt, G. E.;
Jamar, C.; Mackay, C. D.; Malaise, D.; Schmidt, W. K. H.; Seige, P.;
Whipple, F. L.; Wilhelm, K.
Bibcode: 1981giot.proc..105K
Altcode:
No abstract at ADS
Title: High-resolution Lyman-alpha filtergrams of the sun
Authors: Bonnet, R. M.; Decaudin, M.; Bruner, E. C., Jr.; Acton,
L. W.; Brown, W. A.
Bibcode: 1980ApJ...237L..47B
Altcode:
The results of an experiment, conducted jointly by the Lockheed Palo
Alto Research Laboratory and the Laboratoire de Physique Stellaire et
Planetaire du CNRS, which investigated the transition-region plasma
and the geometry of coronal active regions, in relation to models of
the high-temperature layers, are presented. A Black Brant rocket was
used to obtain 1-arc sec resolution L-alpha pictures of the sun, which
revealed small scale features not seen previously at this wavelength,
that delineate the geometry of the magnetic field in the chromosphere
and in the corona. It is concluded that these observations might
provide a new way of observing the upper chromosphere and corona,
and that they provide direct evidence of the inhomogeneous character
of the chromosphere and of the dominant role of the magnetic field
Title: The contribution of OSO-8 to solar physics from data analyzed
as of May 1979.
Authors: Bonnet, R. M.
Bibcode: 1980spre.conf..239B
Altcode: 1980spre.proc..239B
The NASA Orbiting Solar Observatory-8 was launched on 21 June 1975
and was operated for 39 months. The main results obtained to date
with the four solar instruments on board the spacecraft are reviewed
and presented in a synthetic form. The main contribution of OSO-8
to solar physics is in the area of wave propagation, dynamics of the
upper chromosphere, models of the chromosphere and transition region
and solar activity.
Title: Introduction
Authors: Bonnet, R. M.
Bibcode: 1980fsoo.conf..133B
Altcode:
No abstract at ADS
Title: Solar Research from Space
Authors: Bonnet, R.
Bibcode: 1980jfss.conf..312B
Altcode:
No abstract at ADS
Title: High Resolution Lyman Alpha Filtergrams of the Sun
Authors: Bonnet, R. M.; Decaudin, M.; Bruner, E. C.; Acton, L. W.;
Brown, W. A.
Bibcode: 1979BAAS...11..640B
Altcode:
No abstract at ADS
Title: Astronomical Observations from Outside the Terrestrial
Atmosphere
Authors: Bonnet, R. M.
Bibcode: 1979IAUTA..17c.165B
Altcode: 1979IAUT...17..165B
No abstract at ADS
Title: BD Identification of Stars in some Galactic Regions Observed
by S. W. McCuskey
Authors: Bonnet, R.
Bibcode: 1979BICDS..16....7B
Altcode:
No abstract at ADS
Title: Calibrated full disk solar H I Lyman-alpha and Lyman-beta
profiles.
Authors: Lemaire, P.; Charra, J.; Jouchoux, A.; Vidal-Madjar, A.;
Artzner, G. E.; Vial, J. C.; Bonnet, R. M.; Skumanich, A.
Bibcode: 1978ApJ...223L..55L
Altcode:
Resolved solar H I Ly-alpha and -beta profiles have been recorded by the
French LPSP experiment on OSO 8. Intensity observations at the center
and the limb have been combined to obtain flux-equivalent profiles
(5.46 plus or minus 30 percent and 0.078 plus or minus 25 percent
erg/sq cm per sec for Ly-alpha and -beta, respectively). Comparison of
the flux profiles with unresolved calibration rocket profiles allows
one to obtain an absolute calibration.
Title: The LPSP instrument on OSO 8. II. In-flight performance and
preliminary results.
Authors: Bonnet, R. M.; Lemaire, P.; Vial, J. C.; Artzner, G.;
Gouttebroze, P.; Jouchoux, A.; Leibacher, J. W.; Skumanich, A.;
Vidal-Madjar, A.
Bibcode: 1978ApJ...221.1032B
Altcode:
The paper describes the in-flight performance for the first 18 months of
operation of the LPSP (Laboratoire de Physique Stellaire et Planetaire)
instrument incorporated in the OSO 8 launched June 1975. By means of
the instrument, an absolute pointing accuracy of nearly one second
was achieved in orbit during real-time operations. The instrument
uses a Cassegrain telescope and a spectrometer simultaneously
observing six wavelengths. In-flight performance is discussed with
attention to angular resolution, spectral resolution, dispersion
and grating mechanism (spectral scanner) stability, scattered light
background and dark current, photometric standardization, and absolute
calibration. Real-time operation and problems are considered with
reference to pointing system problems, target acquisition, and L-alpha
modulation. Preliminary results involving the observational program,
quiet sun and chromospheric studies, quiet chromospheric oscillation
and transients, sunspots and active regions, prominences, and aeronomy
investigations are reported.
Title: Doppler Shifts measured in 0 VI line from OSO-B observations
above and in the vicinity of plage Mc Math 13738.
Authors: Lemaire, P.; Skumanich, A.; Artzner, G.; Gouttebroze, P.;
Vial, J. C.; Bonnet, R. M.; McWhirter, P.
Bibcode: 1978BAAS...10Q.440L
Altcode:
No abstract at ADS
Title: OSO-8 Radio and X-ray observations of the 19 April 1977 flare.
Authors: Skumanich, A.; Jouchoux, A.; Castelli, J.; Lemaire, P.;
Artzner, G.; Gouttebroze, P.; Vial, J. C.; Bonnet, R. M.
Bibcode: 1978BAAS...10..441S
Altcode:
No abstract at ADS
Title: High Resolution UV Solar Spectroscopy
Authors: Bonnet, R. M.
Bibcode: 1978SSRv...21..379B
Altcode:
The advantages of high resolution UV spectroscopy for the investigation
of the solar atmosphere are stressed while the limitations in the areas
of instrumentation and diagnosis are discussed. The recent achievements
(made essentially by Skylab, OSO-8 and rocket instruments) are reviewed
and discussed. It is shown that high resolution UV solar spectroscopy
has improved our knowledge of the dynamics of the upper layers of
the solar atmosphere. Within the present instrument capabilities the
birth of coronal expansion is shown to take place at the top of the
transition region. The existence of downward flows over the bright
regions of the network is evidenced from redshifts or transition
region and chromospheric optically thin lines: velocities as large as
22 km s-1 have been measured in O vi. Short period waves
(95 s) have been detected in lines of Si ii at chromospheric levels in
addition to the well known 300s and 180 s photospheric and chromospheric
oscillations. There is strong evidence that optically thin chromospheric
and transition region lines are broadened by a nonthermal velocity
component which is maximum at 1.3 × 105 K and decreases
at higher temperatures. This may indicate the presence of unresolved
acoustic or magnetohydrodynamic waves so oftenly set fourth as the
source of chromospheric and coronal heating. Contradictions between the
various results are pointed out and discussed. They might be attributed
to the different angular resolution of the instruments, a key parameter
for future space observations. It is suggested that the Solar Optical
Telescope (SOT) and the Grazing Incidence Solar Telescope (GRIST) which
are presently under phase A studies at NASA and ESA be considered as
a tandem of instruments to fly on Spacelab in the 1980's. Both their
angular and spectral resolution appear sufficient to resolve most of
the problems under discussion today.
Title: Solar ultraviolet Doppler camera.
Authors: Bruner, E. C.; Bonnet, R. M.
Bibcode: 1978nisa.symp...85B
Altcode: 1978nisa.conf...85B
No abstract at ADS
Title: Study of Spectral Lines from Which to Detect Stellar
Chomospheres in A-Type Stars
Authors: Bonnet, R. M.
Bibcode: 1978iue..prop..150B
Altcode:
No abstract at ADS
Title: A Search for the Solar Feature at 2085 A in the Continuous
Spectrum of A, F and G. Stars
Authors: Bonnet, R. M.
Bibcode: 1978iue..prop..148B
Altcode:
No abstract at ADS
Title: The Sun as a Guide for Stellar Studies and Technical Problems
Related to Spatial and Spectral Resolution
Authors: Bonnet, R. M.
Bibcode: 1978hrs..conf..285B
Altcode:
No abstract at ADS
Title: Vacuum ultraviolet astrophysics.
Authors: Bonnet, R. M.
Bibcode: 1978AnPh....3..409B
Altcode:
No abstract at ADS
Title: The solar flux in the far ultraviolet: origin, relative
variations.
Authors: Bonnet, R. M.
Bibcode: 1977AnG....33..409B
Altcode:
The paper deals mainly with the UV part of the solar spectrum which
interacts effectively with the atmosphere of our planet. The model of
the external layers of the solar atmosphere is described briefly and
it is shown that each region of the sun's atmosphere emits radiation
at different wavelengths. Three main features govern the emission:
the supergranulation, the corona, and active regions. The morphology
of the disk is described from observations made with balloons, rockets
and satellites. The short and long term variability of the solar flux
is studied and it is suggested that the long term variability may be
of greater importance for climatology. Finally, two indexes currently
used by atmospherists, the 10.7 cm flux and Wolf number, are discussed
and recommended to be used with some caution.
Title: EUV observations of class-C X-ray flare by the LPSP
(Laboratoire de Physique Stellaire et Planétaire du Centre National
de la Recherche Scientifique) spectrometer on OSO-8.
Authors: Jouchoux, A.; Skumanich, A.; Bonnet, R. M.; Lemaire, P.;
Artzner, G.; Leibacher, J.; Vial, J. C.; Vidal-Madjar, A.
Bibcode: 1977BAAS....9..432J
Altcode:
No abstract at ADS
Title: The LPSP experiment on OSO-8. I - Instrumentation, description
of operations, laboratory calibrations and pre-launch performances
Authors: Artzner, G.; Bonnet, R. M.; Vial, J. C.; Jouchoux, A.;
Leibacher, J.; Vidal-Madjar, A.; Lemaire, P.
Bibcode: 1977SSI.....3..131A
Altcode:
The characteristics of OSO-8, including its solar-pointed instrument
assembly and rasters, are discussed, as well as the accompanying
Laboratoire de Physique Stellaire et Planetaire (LPSP) instrumentation,
which is designed to study the solar atmosphere with high spatial,
spectral, and temporal resolution. The LPSP instrument, which consists
of two subassemblies, a Cassegrainian telescope and a spectrometer,
is described; main optical characteristics, including spectral lines
observed, and means of correcting aberrations and eliminating stray
light, are given for the spectrometer. Detectors and their capacities,
and various filter wheel configurations available for detection of
polarized light and discrimination of low orders of diffraction, are
also described. The observation program, which consists of a study of
solar prominences, flares, and dynamic and three-dimensional physical
structures of the chromosphere, as well as determination of seasonal
variations of some gases in earth's atmosphere, is reviewed. A detailed
account of pre-launch tests and calibration procedures is also given.
Title: Hourly variations in O VI P Cygni profiles of hot stars.
Authors: York, D. G.; Vidal-Madjar, A.; Laurent, C.; Bonnet, R.
Bibcode: 1977ApJ...213L..61Y
Altcode:
Significant changes in the ultraviolet absorption profiles are reported
in the spectra of Delta Ori A, Iota Ori, and Zeta Pup. The present data
show changes in count rates in excess of 30 per cent at velocities
more negative than -900 km/s, if these data are interpreted as being
dominated by O VI absorption in stellar winds. The time scales range
from 1 to 6 hours.
Title: Extreme-Ultraviolet Observations of New Cycle Sunspots with
the LPSP Spectrometer from OSO-8
Authors: Skumanich, A.; Jouchoux, A.; Artzner, G.; Bonnet, R. M.;
Leibacher, J.; Lemaire, P.; Vial, J. C.; Vidal-Madjar, A.
Bibcode: 1977BAAS....9..340S
Altcode:
No abstract at ADS
Title: On VI Profiles of Solar Quiet and Active Areas Recorded by
OSO-8 LPSP Experiment".
Authors: Lemaire, P.; Artzner, G.; Vial, J. C.; Bonnet, R. M.;
Gottebroze, P.; Jouchoux, A.; Vidal-Madjar, A.; McWhirter, P.;
Leibacher, J.; Skumainich, A.
Bibcode: 1977uxsa.coll...46L
Altcode: 1977IAUCo..43...46L
No abstract at ADS
Title: The ratio of deuterium to hydrogen in interstellar
space. III. The lines of sight to Zeta Puppis and Gamma Cassiopeiae.
Authors: Vidal-Madjar, A.; Laurent, C.; Bonnet, R. M.; York, D. G.
Bibcode: 1977ApJ...211...91V
Altcode:
An extensive set of measurements of the ratio of deuterium to hydrogen
in the interstellar medium has been undertaken. The general observing
program is described along with the data reduction techniques used to
separate the complex deuterium and hydrogen profiles, and the results
of the measurements for two stars, Zeta Pup and Gamma Cas. For Gamma
Cas, log N(D)/N(H) is found to be approximately -4.8, in agreement
with previous measurements. For Zeta Pup, a complicated structure
of absorbing clouds in the interstellar medium is inferred. The best
value of log N(D)/N(H) is about -4.6 for each of two components. One
component is probably more complex than can be demonstrated directly
at the resolution employed, and log N(D)N(H) could be -4.0 or larger
in this component.
Title: High Resolution UV Solar Spectroscopy.
Authors: Bonnet, R. M.
Bibcode: 1977uxsa.collE...1B
Altcode: 1977IAUCo..43Q....B
No abstract at ADS
Title: The Solar Extreme Ultraviolet Continuum
Authors: Bonnet, R. M.
Bibcode: 1976RSPTA.281..305B
Altcode: 1976RSLPT.281..305B
The most recent results on the e.u.v. continuous emission of the
Sun are reviewed, and intercompared. They are discussed in terms of
the distribution of temperature in the solar atmosphere particularly
in view of determining more precisely the value of the temperature
minimum. An attempt will be made to interpret the discrepancies which
exist between the observations and the results deduced from theoretical
consideration in terms of an unknown source of continuous opacity.
Title: OSO-8 Observations of the EUV Chromospheric Network
Authors: Artzner, G.; Bonnet, R. M.; Leibacher, J.; Lemaire, P.;
Skumanich, A.; Vial, J. C.; Vidal-Madjar, A.
Bibcode: 1976BAAS....8..332A
Altcode:
No abstract at ADS
Title: Solar OVI Profiles as Observed by the French Experiment
Aboard OSO-8
Authors: Lemaire, P.; Artzner, G.; Bonnet, R. M.; Vial, F. C.;
Skumanich, A.; Leibacher, J.; Vidal-Madjar, A.
Bibcode: 1976BAAS....8R.331L
Altcode:
No abstract at ADS
Title: Evolution of sunspot and active region morphology as observed
on the resonance lines of Ca+ (K, H), Mg+
(k, h), hydrogen (Lalpha , Lbeta ), and O VI from OSO-8 (LPSP).
Authors: Artzner, G.; Skumanich, A.; Bonnet, R. M.; Vidal-Madjar,
A.; Leibacher, J.; Lemaire, P.; Vial, J. C.
Bibcode: 1976BAAS....8..397A
Altcode:
No abstract at ADS
Title: Periodic temporal phenomena in the solar chromosphere as
observed from OSO-8 (LPSP).
Authors: Vial, J. C.; Leibacher, J.; Lemaire, P.; Artzner, G.; Bonnet,
R. M.; Skumanich, A.; Vidal-Madjar, A.
Bibcode: 1976BAAS....8..397V
Altcode:
No abstract at ADS
Title: Spatial variations of solar profiles of Ca+ H and
K, Mg+ h and k, and Lyman alpha and beta (H I) resonance
lines as observed from OSO-8 (LPSP).
Authors: Bonnet, R. M.; Artzner, G.; Leibacher, J.; Lemaire, P.;
Skumanich, A.; Vial, J. C.; Vidal-Madjar, A.
Bibcode: 1976BAAS....8..397B
Altcode:
No abstract at ADS
Title: Prominence Observations with the OSO-8 French Experiment
Authors: Vial, J. C.; Artzner, G.; Bonnet, R. M.; Lemaire, P.;
Leibacher, J.; Skumanich, A.; Vidalmadjar, A.
Bibcode: 1976BAAS....8..344V
Altcode:
No abstract at ADS
Title: Astronomical observations from outside the terrestrial
atmosphere.
Authors: Code, A. D.; Bonnet, R. M.; Gorenstein, P.; Harper, D. A.;
York, D. G.; van Duinen, R.; Wesselius, P.; de Jager, C.; Gurzadyan,
G. A.; de Graaf, W.; Kondo, Y.
Bibcode: 1976IAUTA..16c.195C
Altcode:
No abstract at ADS
Title: Solar activity (Activité solaire).
Authors: Newkirk, G.; Dunn, R. B.; Mehltretter, P.; MacQueen, R.;
Bonnet, R. M.; White, O. R.; Fokker, A. D.; Zwaan, C.; Bruzek, A.;
Durrant, C.; Grossmann-Doerth, U.; Mehltretter, J. P.; Svestka, Z.;
de Feiter, L. D.; Tandberg-Hanssen, E.; Howard, R.; Stix, M.; Pneuman,
G. W.; Hundhausen, A. J.; Sawyer, C.; Simon, P.
Bibcode: 1976IAUTA..16b..13N
Altcode:
No abstract at ADS
Title: High-Resolution Atmospheric Extinction Measurements from the
French Experiment on Board the NASA Spacecraft OSO-8
Authors: Vidal-Madjar, A.; Roble, R. G.; Mankin, W. G.; Artzner, G.;
Bonnet, R. M.; Lemaire, P.; Vial, J. C.
Bibcode: 1976ASSL...61..117V
Altcode: 1976aps..conf..117V
No abstract at ADS
Title: High resolution atmospheric extinction measurements from the
French experiment on board the NASA spacecraft OSO-8
Authors: Vidal-Madjar, A.; Artzner, G.; Bonnet, R. M.; Lemaire, P.;
Vial, J. C.; Roble, R. G.; Mankin, W. G.
Bibcode: 1976atps.proc..117V
Altcode:
The French instrument aboard OSO-8 is a multichannel, high-resolution UV
spectrometer for observing very small areas of the sun simultaneously
in the Ca II, Mg II, Lyman alpha, and Lyman beta lines. By observing
extinction through the earth atmosphere, the spectrometer studies the
three-dimensional structure and the composition of the atmosphere. The
quality of data appears to give a 500 m vertical resolution both for
O3 and O2; O3 is observed primarily from 55 to 75 km, while O2 is
observed from 85 to 200 km. Data on the hydrogen absorption present a
new method for evaluating exospheric temperature and atomic hydrogen
density at each point of the exobase.
Title: Stigmatic spectra of the sun between 1200 Å and 2100 Å.
Authors: Samain, D.; Bonnet, R. M.; Gayet, R.; Lizambert, C.
Bibcode: 1975A&A....39...71S
Altcode:
Stigmatic spectra of the sun from 1200 to 2100 A, with spatial
resolution on the disk of 7 arc sec, have been obtained during a rocket
flight on April 17, 1973 from Kourou, French Guiana. The mean spectral
resolution achieved is 0.4A. Absolute intensities and center-to-limb
variations of the solar UV continuum have been measured on both sides
of the temperature minimum. They locate the position of this minimum
around 1580 A with a value of 4430 (plus or minus 50) K. It is shown
that these are upper limits and are not necessarily incompatible with
infrared observations which lead to lower values. It is shown that
an extra opacity is required to represent the observations down to,
at least, 1580 A.
Title: Identifications of HDE stars
Authors: Ochsenbein, F.; Bonnet, R.
Bibcode: 1975BICDS...8....8O
Altcode:
No abstract at ADS
Title: Future programs in solar physics from space
Authors: Bonnet, R. M.
Bibcode: 1975esm..meet...93B
Altcode:
The cited solar-physics programs are grouped into two categories:
those that have already been initiated or approved and those that are
planned for the Space Shuttle era. The first category includes the OSO 1
mission, the French satellite D2B, and the NASA-ESRO International Sun
Earth Explorer (ISEE) series. The second category includes the Solar
Maximum Mission, scheduled for 1977, and the Solar Telescope Cluster,
planned for the late 1980's. The goals of each program are outlined,
and the instruments to be used are briefly described.
Title: Future programs in solar physics from space.
Authors: Bonnet, R. M.
Bibcode: 1975MmArc.105...93B
Altcode:
No abstract at ADS
Title: Future programs in solar physics from space
Authors: Bonnet, R. M.
Bibcode: 1975cesra...5...93B
Altcode:
No abstract at ADS
Title: Book review
Authors: Bonnet, R. M.
Bibcode: 1973SoPh...33..524B
Altcode:
No abstract at ADS
Title: Astronomical observations from outside the terrestrial
atmosphere (Observations astronomiques audehors de l'atmosphère
terrestre).
Authors: Prokof'ev, V.; Bonnet, R. M.; Dalgarno, A.; Code, A. D.;
Savage, B. D.; Boggess, A.
Bibcode: 1973IAUTA..15..671P
Altcode:
No abstract at ADS
Title: Analysis of the ultraviolet spectrum of A-type stars observed
by the OAO II satellite.
Authors: Gros, M.; Sacotte, D.; Praderie, F.; Bonnet, R. M.
Bibcode: 1973A&A....27..167G
Altcode:
Summary. Observations of Lep, y Gem, cc C Ma, fi Aur, fi U Ma, fi Car,
cc Dra obtained by the Wisconsin Experiment Package on the OAO II
satellite are reduced to obtain the ultraviolet energy distribution of
these stars. For each star we compare, with the help of classical model
atmospheres, theoretical and observed ultraviolet spectra. We offer an
explanation for the non observation of the Sii 1520A photoionization
discontinuity by studying the evolution of the synthetic spectrum
in this spectral range with temperature and abundances. In the range
2200-2500 A we find that the theoretical fluxes tend to be larger than
the observed ones; we suggest that a continuous or pseudo- continuous
opacity could be present for stars as hot as the A0 type. By comparison
between the observed and the synthetic spectra we perform some line
identification between 1000 and 3000 A. We finally estimate the line
blocking between 2300 and 3000A for cc C Ma. Key words: ultraviolet
spectrum - A-type stars - photo- ionization discontinuities - blocking
effect
Title: The Blocking Effect of Lines on Solar UV Continuum between
2000Å and 3000Å
Authors: Sacotte, D.; Bonnet, R. M.
Bibcode: 1972A&A....17...60S
Altcode:
No abstract at ADS
Title: La coopération internationale sur le satellite Américain
OSO-1.
Authors: Bonnet, R. M.
Bibcode: 1972BONic...9....5B
Altcode:
No abstract at ADS
Title: Opacity sources in the UV spectrum of the sun.
Authors: Bonnet, R. M.; Sacotte, D.
Bibcode: 1971adiu.conf..495B
Altcode:
No abstract at ADS
Title: Opacity Sources in the UV Spectrum of the Sun
Authors: Bonnet, R. M.; Sacotte, D.
Bibcode: 1971HiA.....2..495B
Altcode:
No abstract at ADS
Title: Limb-Darkening Observations between 1800 and 2900 Å
Authors: Bonnet, R. M.; Blamont, J. E.
Bibcode: 1968SoPh....3...64B
Altcode:
We succeeded in several attempts at measuring the solar limb-darkening
in the continuous spectrum between 1800 Å and 2900 Å. Good
spectroheliograms were obtained during a rocket flight in November
1964 and during a balloon flight in October 1966 at 2190 Å, 2665 Å,
2885 Å, and 1980 Å, 2235 Å respectively. A rocket flown at the
beginning of 1967 provided excellent spectra allowing the measurement
of center-to-limb variation in the continuum and lines from 1800 Å
to 2800 Å.
Title: Recherches sur l'émission continue du soleil entre 1950
Å et 3000 Å Title: Recherches sur l'émission continue du soleil
entre 1950 Å et 3000 Å Title: Research on the continuous emission
of the sun between 1950 Å and 3000 Å;
Authors: Bonnet, Roger Maurice
Bibcode: 1968PhDT.......150B
Altcode:
No abstract at ADS
Title: Limb-Darkening Observations from 1800 TO 2800 Å
Authors: Bonnet, R. M.; Blamont, J. E.; Gildwarg, P.
Bibcode: 1967ApJ...148L.115B
Altcode:
No abstract at ADS
Title: Deux expériences du programme français d'astronomie spatiale
(suite)
Authors: Bonnet, R. M.
Bibcode: 1966LAstr..80..225B
Altcode:
No abstract at ADS
Title: Deux expériences du programme français d'astronomie spatiale
Authors: Bonnet, R. M.
Bibcode: 1966LAstr..80..191B
Altcode:
No abstract at ADS
Title: Un filtre à bandes passantes multiples et réglables destiné
à l'étude du continu solaire ultraviolet
Authors: Bonnet, R. M.; Courtès, G.
Bibcode: 1962AnAp...25..367B
Altcode:
No abstract at ADS
Title: Un filtre a bandes passantes multiples et reglables destine
a l'etude du continu solaire ultra-violet
Authors: Bonnet, Roger-M.; Courtes, Georges
Bibcode: 1962POHP....6Q....B
Altcode:
No abstract at ADS
Title: Publication des observations d'étoiles doubles de P. Fatou
Authors: Bonnet, R.
Bibcode: 1941JO.....24...41B
Altcode:
No abstract at ADS
Title: Publication des observations d'étoiles doubles de P. Fatou
Authors: Bonnet, R.
Bibcode: 1941JO.....24...29B
Altcode:
No abstract at ADS
Title: Méthode abrégée pour le calcul des distances zénithales
d'une même étoile observée plusieurs fois à l'astrolabe
Authors: Bonnet, R.
Bibcode: 1928JO.....11..106B
Altcode:
No abstract at ADS
Title: Positions photographiques de planètes
Authors: Bonnet, R.; Pourteau, A.
Bibcode: 1923JO......6...21B
Altcode:
No abstract at ADS
Title: Positions photographiques de planètes
Authors: Pourteau, A.; Bonnet, R.
Bibcode: 1923JO......6...21P
Altcode:
No abstract at ADS
Title: Positions photographiques de planètes
Authors: Bonnet, R.
Bibcode: 1921JO......4...42B
Altcode:
No abstract at ADS
Title: Positions photographiques de planètes
Authors: Bonnet, R.
Bibcode: 1921JO......4...25B
Altcode:
No abstract at ADS