Author name code: righini
ADS astronomy entries on 2022-09-14
author:"Righini, Alberto"
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Title: Imaging performance of multi-etalon bidimensional spectrometers
Authors: Righini, A.; Cavallini, F.; Reardon, K. P.
Bibcode: 2010A&A...515A..85R
Altcode:
Aims: In recent years, several new solar and nighttime
panoramic spectrometers based on Fabry-Perot interferometers have
been successfully developed. In this paper we evaluate the imaging
performance of the two types of mountings that have been adopted,
telecentric and classic, in particular trying to understand which one
might be more suitable for future large-aperture solar telescopes.
Methods: Numerical code was written to simulate the behavior of such
spectrometers, on the basis of the theory of Fourier optics. This code
was used to simulate different instrument configurations and was tested
on previous results obtained either analytically or numerically by
other authors.
Results: Calculations of the system MTF and Strehl
ratios show that both mountings may perform very close to theoretical
expectations. However, gap irregularities in the interferometers
may alter the optical quality of the monochromatic images. In the
case of the classical mounting in a collimated beam, it is possible
to partially compensate for the resulting errors in the wavefront
emerging from the interferometers with a suitable phase plate. We also
performed an observational test of the optical quality delivered by
the IBIS interferometer installed at the Dunn Solar Telescope of the
National Solar Observatory, with the results substantially confirming
the calculations.
Conclusions: It follows from our results
that both mountings may be efficiently used for solar bidimensional
spectroscopy. The final choice depends on the tradeoff between factors
such as image quality, field of view, and acceptable wavelength shift.
Title: The telescope in the making, the Galileo first telescopic
observations
Authors: Righini, Alberto
Bibcode: 2010IAUS..269...27R
Altcode:
In the first part of this paper we briefly discuss some historical
constraints useful for understanding when Galileo for the first time
aimed his telescope to the Moon which most probably was the first
astronomical object observed by the Scientist. In the second part we
discuss the dates of the observations on which the etchings, published
in the Sidereus Nuncius, are based. It results that the five etchings
refer to observations performed in December 1609 and January 1610. The
measurement of the position, of some peculiar structures of the lunar
surface clearly represented by Galileo in the etchings, shows that he
was very careful in trying to produce a faithful graphical rendering
of what he was observing.
Title: Leonardo Ximenes S. J. e lo Gnomone di Santa Maria del Fiore,
in Firenze
Authors: Mazzucconi, Fabrizio; Ranfagni, Piero; Righini, Alberto
Bibcode: 2006AsUAI...2...70M
Altcode:
No abstract at ADS
Title: Leonardo Ximenes S. J. e il grande gnomone di Santa Maria
del Fiore, in Firenze
Authors: Mazzucconi, Fabrizio; Ranfagni, Piero; Righini, Alberto
Bibcode: 2006GAst...32a..83M
Altcode: 2006GidA...32a..83M
No abstract at ADS
Title: Book Review: Il Sole nella Chiesa. Le grandi chiese come
osservatori astronomici. Editrice Compositori, Bologna, 2005, 426
pp. ISBN 88-7794-506-0.
Authors: Righini, Alberto
Bibcode: 2006GAst...32a.126R
Altcode: 2006GidA...32a.126R
No abstract at ADS
Title: La costruzione della Torre Solare di Arcetri nel carteggio
Hale-Abetti
Authors: Gasperini, Antonella; Mazzoni, Massimo; Righini, Alberto
Bibcode: 2004GAst...30c..23G
Altcode:
No abstract at ADS
Title: Thermal effects in the Solar Disk Sextant telescope
Authors: Spagnesi, Chiara; Vannoni, Maurizio; Molesini, Giuseppe;
Righini, Alberto
Bibcode: 2004SPIE.5249..746S
Altcode:
The Solar Disk Sextant (SDS) is an instrument conceived to monitor
the diameter of the Sun and its oscillations. A key component of the
SDS is the Beam Splitting Wedge (BSW), whose function is to provide
calibration to the geometry of the focal plane. The thermal behavior
of the BSW is critical, as it affects the overall performance of the
instrument. Modeling the elements of the BSW and the basic thermal
processes is shown to account for experimental evidences of defocusing
observed in early measurements with a balloon borne prototype. Basic
requirements for accurate thermal stabilization on board of the final
instrument are derived.
Title: Minor Planet Observations [598 Loiano]
Authors: Carpino, M.; Righini, A.; Gualandi, R.; Forti, G.
Bibcode: 2003MPC..49907...1C
Altcode:
No abstract at ADS
Title: Line bisectors in granular and intergranular matter
Authors: Maltagliati, L.; Righini, A.
Bibcode: 2003MmSAI..74..599M
Altcode:
In this paper we study granular and intergranular spectral line
bisectors obtained from spectroscopic images of the solar granulation
taken at the THEMIS telescope, in IPM mode. Granular bisectors always
maintain the characteristic C-shape, independently of the size of
the granules showing an overshoot of ascending hot plumes. Instead
the shape of intergranular bisectors is much less curve suggesting
that, in the intergranular lanes, the descending plasma has an almost
constant velocity. We conclude that the kinetic description of the
solar granulation which arises from our analysis is compatible with the
results of numeric simulations. This research has been financed
by University of Florence
Title: One century of Solar Physics in Italy 1850-1950
Authors: Righini, A.
Bibcode: 2003MmSAI..74..556R
Altcode:
In this paper we briefly describe the story of Solar Physics in
Italy during one century and we try to evaluate its international
impact. At the beginning, in the serendipitous phase, we have e relevant
contribution of italian solar physicist like Secchi and Tacchini. The
choice of the Abetti father and son to build in Arcetri a Solar Tower,
under the technical supervision of George Ellery Hale, could have given
to italian solar physics the trust to compete in the international
arena. However the lack of necessary technology, the war, and the
choice to use the tower for patrol of the solar chromosphere kept
italian solar physics from developing at the level of its competitors
at the end of the first half of the XX century.
Title: HETE GRB030329, correction to Rc observations in Loiano.
Authors: Pizzichini, G.; Ferrero, P.; Bartolini, C.; Guarnieri, A.;
Piccioni, A.; Righini, A.; Bruni, I.
Bibcode: 2003GCN..2228....1P
Altcode:
No abstract at ADS
Title: GRB 030329: Rc photometry in Loiano.
Authors: Pizzichini, G.; Ferrero, P.; Bartolini, C.; Guarnieri, A.;
Piccioni, A.; Righini, A.; Bruni, I.
Bibcode: 2003GCN..2136....1P
Altcode:
No abstract at ADS
Title: Il Forum sulla didattica di Firenze.
Authors: Righini, A.
Bibcode: 1999GAst...25b..24R
Altcode:
No abstract at ADS
Title: Italian panoramic monochromator for the THEMIS telescope:
the first results and instrument evaluation
Authors: Cavallini, Fabio; Berrilli, Francesco; Caccin, Bruno;
Cantarano, Sergio; Ceppatelli, Guido; Egidi, Alberto; Righini, Alberto
Bibcode: 1998SPIE.3355..940C
Altcode:
We briefly describe the design and the characteristics of the Italian
Panoramic Monochromator installed at the focal plane of the THEMIS
telescope built in Izana by a joint venture of the French and Italian
National Research Councils. The Panoramic Monochromator substantially
is a narrow band filter (approximately equals 22 mAngstrom bandwidth)
tunable on the visible spectrum for quasi simultaneous bidimensional
spectrometry of the solar atmosphere. The narrow bandwidth is
obtained by using a non standard birefringent filter and a Fabry Perot
interferometer mounted in series. This assembly has the advantage of
the spectral purity of one channel of the Fabry Perot interferometer
and a very large free spectral range. Moreover the spectral stability
depends on the interferometer, the environment of which may be carefully
controlled. The design of this instrument is not really new, but,
only now it has been possible to build it thanks to the development
of servo controlled Fabry Perot interferometers, which are stable in
time and may easily be tuned. The system seems to perform well. It is
stable in wavelength and the spectral pass band and stray light are
within the expected values, as it may be deduced by very preliminary
tests performed at the THEMIS Telescope and in Arcetri (Firenze) at the
'G. B. Donati' solar tower.
Title: The IPM-Italian Panoramic Monochromator operating at the
THEMIS telescope.
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.; Berrilli, F.;
Caccin, B.; Cantarano, S.; Egidi, A.
Bibcode: 1997cpyt.conf..119C
Altcode:
From April 20, 1997 the Italian Panoramic Monochromator (henceforth IPM)
will be the first operating mode of the THEMIS telescope. It basically
consists of a Fabry-Perot interferometer mounted in tandem with an
universal birefringent filter. The image acquisition system consists
of two CCD cameras controlled and read-out by dedicated electronics and
personal computers. One of these cameras acquires a simultaneous white
light image for the application of off-line destretching procedures
in order to reduce seeing effects. An optical link connects the CCD
camera and the PCs while the handshaking and the data transfer between
the PCs and the work station controlling the IPM is performed via LAN
and IEE488 bus.
Title: The height dependence of intensity and velocity structures
in the solar photosphere
Authors: Salucci, G.; Bertello, L.; Cavallini, F.; Ceppatelli, G.;
Righini, A.
Bibcode: 1994A&A...285..322S
Altcode:
Results about a statistical analysis of the solar granulation, obtained
by analyzing a series of narrow band (20 mA FWHM) images in the 6162.18
A CaI photospheric line, are presented. The observations have been
performed at the Vacuum Solar Tower of the National Solar Observatory
at Sac. Peak (NM-USA) in 1988, using a Fabry-Perot interferometer and a
Universal Birefringent Filter mounted in tandem. We computed coherence,
phase and power spectra of intensity and velocity fields in a 27"x27"
quiet region at the disk center. Energy spectra, plotted in the usual
log-log coordinates, clearly show a linear shape for wavenumbers between
3 and 10 Mm^-1^. The exponent is -17/3: it does not significatively vary
within the considered photospheric layers and largely differs from both
the theoretical value and the results of previous 1-D observations. This
result indicates that in the photosphere we are in presence of a
redistribution of the convective energy through a cascade from larger
granules to smaller ones, although the size distribution does not follow
the Kolmogorov law. The physical processes involved in the granulation
have been investigated by studying the height dependence of coherence
and phase spectra of Velocity-Velocity (V-V) and Velocity-Intensity
(V-I) fields. We find that the photosphere is divided in two regions:
the velocity structures existing in the lower layers (first region)
are convective and extend up to about 170 km. The decay of these
granular motions generates well correlated velocity structures in the
second region (height range 170-400 km), at spatial frequencies 5-10
Mm^-1^. In this region, moreover, the coherence moderately increases
with height, while the phase is stable around +/-180°. This means
that velocity and intensity fields are predominantly anticorrelated,
as expected for gravity waves.
Title: Book reviews
Authors: Burlaga, L. F.; Kleczek, J.; Schatzman, E.; Adams, D. J.;
Rutten, R. J.; van der Kruit, P. C.; de Jager, Cornelis; Trams, N. R.;
Righini, Alberto; Ergma, E.; Grün, Eberhard; Icke, Vincent
Bibcode: 1994SSRv...67..223B
Altcode:
No abstract at ADS
Title: Book-Review - Guide to the Sun
Authors: Phillips, K. J. H.; Righini, A.
Bibcode: 1994SSRv...67..229P
Altcode:
No abstract at ADS
Title: The influence of the stray light in the solar image on the
Fraunhofer line profiles
Authors: Barducci, A.; Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1994A&A...281..955B
Altcode:
In the solar spectroscopy the scattered light produced by the Earth's
atmosphere and telescope optics may bias the result of spectral
and photometric measurements. The problem of correcting the spectral
observations from the stray light has assumed a great importance in the
studies of large-scale motion into the solar atmosphere. Nevertheless,
it is not yet known how the light smearing may affect the observed
values of the relevant parameters of the Fraunhofer lines, with the
exception of their wavelengths (the so called 'velocity error') which
has been already examined. In this paper we discuss the effects of the
light scattering in the solar image on the spectroscopic measurements
and we discuss some data reduction techniques. Moreover we calculate
the analytical distribution of the velocity error over the solar disk,
obtaining new insights on the understanding of the solar rotation
peculiarities.
Title: An interferometric approach to the measurement of the diffuse
light from optical surfaces and systems
Authors: Greco, V.; Molesini, G.; Quercioli, F.; Righini, A.
Bibcode: 1993A&A...277..345G
Altcode:
Images of astronomical sources are affected by stray light produced
in the Earth atmosphere and in the telescope optics. The stray
light causes a cross-talk phenomenon between intensity and spectral
distribution at the image plane. As far as telescope stray light
is concerned, its amount largely depends on the finish grade of
telescope optics. Available techniques to measure the finish grade of
optical components include the accurate profilometry of the surfaces
and the usage of star simulators. Referring to digital phase-shift
interferometry, a novel technique is presented where the diffuse
light is evaluated after speckle field statistics. This technique
may be easily used to give an a priori estimate of telescope stray
light. At the exit pupil of a measuring interferometer, partially
developed speckle patterns are produced by reflection or transmission
of the probe beam on the optics under test. The standard deviation of
the field distribution is shown to account for the stray light at the
image plane by Fourier transform. The technique is demonstrated on a
set of selected samples of different surface finish. Results prove the
approach suited to qualify single optical components and to properly
model their imaging properties. The application of the speckle technique
to functioning reflecting telescopes is also discussed.
Title: New concepts on SDS: a double beam telescope
Authors: Casini, R.; Greco, V.; Molesini, G.; Quercioli, F.; Reconditi,
M.; Righini, A.
Bibcode: 1993MmSAI..64..255C
Altcode:
No abstract at ADS
Title: First measurements of solar oscillations with the THEMIS
panoramic monochromator
Authors: Berrilli, F.; Caccin, B.; Cantrano, S.; Cavallini, F.;
Ceppatelli, G.; Egidi, A.; Francia, P.; Pietropaolo, E.; Righini, A.
Bibcode: 1993MmSAI..64..781B
Altcode:
No abstract at ADS
Title: Astronomia AL planetario DI Firenze Fossi
Authors: Righini, A.
Bibcode: 1993aapf.book.....R
Altcode: 1993QB15.A85.......
No abstract at ADS
Title: High-resolution spectroscopic imaging of the Sun with a
Universal Birefringent filter and a Fabry-Perot interferometer.
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.; Berrilli, F.;
Caccin, B.; Cantarano, S.; Egidi, A.; Francia, P.; Pietropaolo, E.
Bibcode: 1992NCimC..15..509C
Altcode:
The authors describe an optical device consisting of a Universal
Birefringent Filter and a Fabry-Perot interferometer used in tandem
to obtain monochromatic images of the Sun in the visible spectrum
(between 4200 and 7000 Å). They give an account of the preliminary
results obtained by measuring the global velocity field on the solar
photosphere. These results show that the instrument is well suited
for global oscillation measurements.
Title: Surface Finish Testing by Speckle Interferometry
Authors: Greco, V.; Molesini, G.; Quercioli, F.; Righini, A.
Bibcode: 1992ESOC...42..297G
Altcode: 1992ptit.conf..297G
No abstract at ADS
Title: High resolution granulation spectrophotometry with a UBF and
a FP interferometer in tandem.
Authors: Salucci, G.; Bertello, L.; Righini, A.; Bonaccini, D.;
Cavallini, F.; Ceppatelli, G.
Bibcode: 1992ESASP.344..157S
Altcode: 1992spai.rept..157S
Recent studies have shown that in the solar granulation, granules sizes
lower than 3″may be considered as turbulent eddies. However this
result is in contradiction with morphological studies carried out by
other authors. In this paper the authors analyse in the spatial domain
the autocorrelation and crosscorrelation functions of the velocity
and of the intensity fields at several depths in the solar atmosphere,
using narrow band filtergrams obtained at Sacramento Peak Observatory
Vacuum Tower Telescope with a UBF and a FP interferometer mounted in
tandem. The results show that the granular motion is turbulent for
heights larger than 170 km while at lower heights is convective.
Title: NGC 4051
Authors: Hunt, L. K.; Calamai, G.; Giannuzzo, E.; Salvati, M.; del
Zanna, G.; Mannucci, F.; Righini, A.; Stanga, R.
Bibcode: 1992IAUC.5485....2H
Altcode: 1992IAUC.5485....1H
L. K. Hunt, CAISMI-CNR, Florence; G. Calamai, E. Giannuzzo and
M. Salvati, Arcetri Observatory; and G. Del Zanna, F. Mannucci,
A. Righini and R. Stanga, Department of Astronomy, University
of Florence, e-mail: "According to measurements with the Italian
National Infrared telescope TIRGO, the Seyfert 1 galaxy NGC 4051 is
undergoing an outburst in the near-infrared on a timescale of a few
months. Observations of galaxy-plus-nucleus in a 14" aperture gave
the following K magnitudes: 1991 Apr. 15, 9.90 +/- 0.02; 1992 Jan. 6,
9.76 +/- 0.02; Mar. 6, 9.59 +/- 0.03. If the galaxy's contribution
to the 1991 flux is 0.6, the brightening of the nucleus in Jan. and
Mar. 1992 amounts to 35 and 80 percent, respectively. At the Loiano
station of the Bologna Observatory the galaxy-plus-nucleus B magnitude,
obtained from a CCD image by summing within a 6" aperture, was 14.1 +/-
0.1 on Mar. 17. This observation, and the maximum K magnitude measured
on Mar. 6, are consistent (within the uncertainties) with the 1988
observations of Done et al. (1990, MNRAS 243, 713). In view of the
relevance of the phenomenon to the modeling of the infrared emission of
active galactic nuclei (direct versus dust re-radiation), monitoring
of the outburst is highly recommended, especially at the wavelengths
dominated by the so-called big blue bump (B, U, ultraviolet)."
Title: About Spectroscopic Measurements of the Solar Meridional Motion
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1992A&A...254..381C
Altcode:
A large number of spectroscopic measurements of meridional mass
motion on the Sun has been carried out in the past. The results are
rather contradictory, although a 10 ms-1 poleward flow
might be inferred. Some authors have pointed out that the so called
"meridional motion" might be ascribed to a latitudinal dependence of
the convective flux. In this paper we describe new observations carried
out with the spectro-interferometer installed at the G.B. Donati Solar
Tower in Arcetri: these measurements have been performed using lines
having either similar or very different physical parameters in order
to disentangle convective effects from true mass flows. We discuss the
results and we conclude that the great variety of "meridional motions"
so far observed by spectroscopic means may be ascribed to an intrinsic
variability of the meridional flow pattern and in part to the presence
of a large scale velocity field.
Title: The solar aureola - Theory and observations
Authors: Barducci, A.; Righini, A.; Cavallini, F.; Ceppatelli, G.
Bibcode: 1990A&A...240..203B
Altcode:
The stray light, which originates in the earth atmosphere and in the
telescope optics, produces a 'cross-talk' between spectral as well
as intensity information held in different picture elements. In this
paper the mathematical formulation of the scattering processes and
their dependence on the wavelength and on the zenith distance of the
source are discussed and compared with aureola observations carrried
out at the G.B. Donati Solar Tower in Arcetri. The analysis confirms
the zenith and wavelength dependence of the relevant aureola parameters
as given by the theory, and shows that the logarithmic description
of the aureola intensity, sometime given by other authors, correctly
applies also to the Arcetri measurements. This result suggests the
possibility of evaluating the stray light effects on spectroscopic
and photometric observations stemming from a few aureola measurements
performed at given distances from the solar limb.
Title: Depth dependence of the intensity-velocity phase difference
in the solar '5-min' oscillations
Authors: Alamanni, N.; Bertello, L.; Righini, A.; Cavallini, F.;
Ceppatelli, G.
Bibcode: 1990A&A...231..518A
Altcode:
Previous measurements carried out on four Fe I photospheric lines have
suggested that the different oscillating power observed on the blue and
red line flanks is produced by the intensity-velocity phase lag in the
'5-min' waves. Former measurements and new additional observations on
the 6149.2 A Fe II and 6162.2 A Ca I lines have been used to evaluate
more accurately the dependence of this intensity-velocity phase
difference on the photospheric height. A nonadiabatic and nonisothermal
bidimensional model of the thermodynamic fluctuations induced in the
photosphere by the high degree p-modes suggests that radiative damping
might explain the observed line profile oscillations.
Title: CA I 6162 A line oscillations observed in a solar active region
Authors: Alamanni, N.; Righini, A.; Cavallini, F.; Ceppatelli, G.
Bibcode: 1990A&A...228..517A
Altcode:
The effect of the magnetic field on the high degree p-modes in the
solar atmosphere is still controversial, both from the theoretical
and the experimental point of view. The temporal behavior of the 6162
A Ca I line profile in an active region has been observed with the
spectrointerferometer of the Arcetri solar tower. It is found that
the presence of magnetic field suppresses several modes of oscillation
and that the line oscillates almost 'rigidly'.
Title: High resolution solar bidimensional spectroscopy with
a universal birefringent filter in tandem with a Fabry-Perot
interferometer
Authors: Bonaccini, D.; Righini, A.; Cavallini, F.; Ceppatelli, G.
Bibcode: 1989A&A...217..368B
Altcode:
The design of an optical device consisting of a universal birefringent
filter and a Fabry-Perot interferometer to obtain monochromatic images
of the solar atmosphere with a spectral resolving power of about 300,000
is discussed. The instrument may be continuously tuned between 4200 A
and 7000 A and, using commercially available Fabry-Perot, may reach a
wavelength stability of about 0.1 mA. This system preserves all the
spatial resolution delivered by the telescope and limits the size
of the observable field to a maximum of 400 widths of the telescope
diffraction pattern.
Title: Polarization properties of a `Zeiss-type' coelostat: The case
of the solar tower in Arcetri
Authors: Capitani, C.; Landi Degl'Innocenti, E.; Cavallini, F.;
Ceppatelli, G.; Landi Degl'Innocenti, M.; Landolfi, M.; Righini, A.
Bibcode: 1989SoPh..120..173C
Altcode:
A theoretical model of the polarization properties of a `Zeiss-type'
coelostat is presented and discussed in detail. The Muller matrix
describing the modification of the Stokes vector of the incident
radiation as a result of the multiple reflections on the coelostat
mirrors is derived as a function of the solar coordinates, the
geometrical configuration of the coelostat, and the parameters defining
the optical properties of the mirrors. These parameters, or more
particularly, the index of refraction n and the extinction coefficient
k, have been evaluated by means of laboratory measurements performed
on a series of specimens having characteristics similar to those of
the coelostat mirrors. The geometry of the coelostat configuration
is described in full detail. The theoretical model has been then
particularized to the case of the Donati Solar Tower in Arcetri,
and some experimental measurements have been performed to check the
correctness of the model. These measurements show the basic adequacy
of the mathematical model, although some offset terms are found in
the Stokes parameters U and V.
Title: Line Bisectors In and Out Magnetic Regions
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1989ASIC..263..283C
Altcode: 1989ssg..conf..283C
No abstract at ADS
Title: Addendum to Technical Report No. 38: comments of the LEST
Site Investigation Team on the referee's reports.
Authors: Brandt, P. N.; Erasmus, D. A.; Kusoffsky, U.; Righini, A.;
Rodriguez, A.; Engvold, O.
Bibcode: 1989attr.book.....B
Altcode:
No abstract at ADS
Title: Report on the Session: Position and Discussion - Solar Data
Authors: Righini, A.; Schröter, E. H.
Bibcode: 1989ASIC..263..295R
Altcode: 1989ssg..conf..295R
No abstract at ADS
Title: Results and conclusions from the meteorological phase of the
LEST site survey.
Authors: Brandt, P. N.; Erasmus, D. A.; Kusoffsky, U.; Righini, A.;
Rodríguez, A.; Engvold, O.
Bibcode: 1989rcfm.book.....B
Altcode:
No abstract at ADS
Title: Evaluation of the new candidate site for LEST in La Palma.
Authors: Rodríguez, A.; Kusoffsky, U.; Brandt, P. N.; Righini, A.
Bibcode: 1989encs.book.....R
Altcode:
Meteorological and micro-climatic conditions were measured at two sites
in the vicinity of the Swedish Solar Telescope at La Palma for a period
of 9 days in October 1989. One site was very close to Swedish Solar
Tower, the other was situated approx. 50 m to the north and 20 m below
the Swedish Telescope site. It is concluded that the new alternative
site (ALT site) performs better than or at least equal to the previously
selected candidate site. At the same time it shows equal or marginally
better microthermal performance than the site of the Swedish Solar
Telescope. The LEST Site Investigation Team recommends the new ALT
site as the final candidate site for LEST on the Canary Islands.
Title: Profile variations of some photospheric lines as observed in
active regions across the solar disk
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1988A&A...205..278C
Altcode:
Some photospheric lines have been observed in active regions at
different distances from the solar disk center. Assuming that the
line weakening monotonically changes with the changing of the magnetic
field intensity, it is established for the observed lines how the line
width, line asymmetry and line shift vary with the magnetic field. In
particular, near the disk center, an increasing red-shift of the higher
part of the lines is observed with the increasing of the field, while,
at the bottom of a strong line, a small blue-shift is observed. These
results may be interpreted as due to the fading of the convection in
active regions produced by the magnetic field.
Title: The spectro-interferometer of the Arcetri Solar Tower
Authors: Cavallini, F.; Ceppatelli, G.; Meco, M.; Paloschi, S.;
Righini, A.
Bibcode: 1987A&A...184..386C
Altcode:
The authors describe the spectro-interferometer installed at the
Arcetri Observatory Solar Tower. This instrument basically consists
of a Fabry-Perot interferometer mounted in tandem with a medium sized
grating spectrograph, acting as order sorter. This mounting allows
the measurement of solar absorption lines in the range 5500 - 6500
Å with high wavelength stability (0.08 mÅ rms in 12 h) and high
spectral resolution (900,000 at 6328 Å). An image guider allows
the pointing of an assigned solar region with an accuracy better
than 2arcsec rms. This instrument, suitable for investigating line
shifts and asymmetries, has been extensively used for studying such
solar problems as meridional mass motions, line asymmetry "5-min"
oscillations, and convective effects in solar active regions.
Title: 5-min oscillations in the wings and bisectors of solar
photospheric Fe I lines
Authors: Cavallini, F.; Ceppateli, G.; Righini, A.; Alamanni, N.
Bibcode: 1987A&A...173..161C
Altcode:
Former observations carried out at the center of the solar disk on three
Fe I photospheric lines have shown that, during the 5-min oscillation,
the bisector and the line flanks show an oscillation amplitude
decreasing in a different way from the line core to the continuum. New
observations, obtained in a magnetically insensitive line, in and
outside the disk center, confirm the previous findings. From these
and the former measurements it follows that the ratio between the
Vrms of the blue and the red flanks in the observed
lines depends on the height in the photosphere. This result may be
qualitatively interpreted as due to the coupling of the velocity and
brightness oscillations in the 5-min waves, and its height dependence
as due to a phase effect.
Title: Interpretation of shifts and asymmetries of Fe I lines in
solar facular areas
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1987A&A...173..155C
Altcode:
An attempt is made to evaluate the effect in active regions of
the suppression of convective phenomena, and of the different line
profiles arising from the fluxtubes on the spatially averaged line
profiles. Through use of a multi-column model, the asymmetries and
shifts of three Fe I photospheric lines (g not equal to 0), observed in
facular areas have been analyzed. It is assumed that the facula consists
of magnetic fluxtubes (1.5 kG field) with a zero downflow embedded in
an atmosphere where the convection is partially inhibited. This model
satisfactorily reproduces the observed line shifts and asymmetries
for all three lines.
Title: Drift Velocities in Flux Tubes Inferred by Spatially Averaged
Line Bisectors
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1987rfsm.conf..110C
Altcode:
The bisectors of the spatially averaged line profiles observed in
active regions may be a useful tool to investigate the drift velocities
within flux tubes. The authors show that a simple heuristic model may
account for the major effects observed in some Fe I line bisectors in
active regions. The model satisfactorily reproduces the behaviour of
the line shifts and asymmetry with the increasing magnetic field. The
authors assume that an active region consists of static magnetic
flux tubes embedded in an atmosphere where the convection is partially
inhibited. However one cannot exclude a slight downflow up to 250 m/s in
the flux tubes. The case of non static flux tubes showing downflows as
large as 1000 - 2000 m/s with disappointing results are also considered.
Title: Meridional Flows and Latitudinal Dependence of the Convection
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1987rfsm.conf...21C
Altcode:
Theoretical studies on the differential rotation of the Sun require a
surface meridional flow. Recent measurements of the drift of tracers
suggest that this flow must be lower than 1.4 m/s, while spectroscopical
measurements give contradictory results. These measurements may be
strongly affected by different convection between equator and poles
produced by the magnetic field which locally inhibits convective
effects. In the last years several measurements of meridional motion
have been performed at the Arcetri Solar Tower. The authors discuss
from a critical point of view the obtained results.
Title: A solar filter for two dimensional spectroscopy
Authors: Bonaccini, Domenico; Righini, A.; Cavallini, F.; Ceppatelli,
G.
Bibcode: 1987LIACo..27..235B
Altcode: 1987oahp.proc..235B
Not Available.
Title: Solar limb effect and meridional flow - Results on the Fe I
lines at 5569.6 A and 5576.1 A
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1986A&A...163..219C
Altcode:
A description is given of an investigation on the center-to-limb
variation of the line asymmetry and shift along the polar and equatorial
diameters of the sun on two Fe I photospheric lines. The observations,
obtained with the Fabry-Perot spectrointerferometer installed at the
Donati Solar Tower Telescope in Arcetri, do not show any significant
latitudinal dependence of the line asymmetry. Instead, the limb shift
curves obtained along the polar diameter systematically differ from
those obtained along the equator. This difference, if interpreted as
due to a surface mass flow, implies a poleward meridional motion with
a maximum of about 50 m/s at 45 deg of latitude in both hemispheres. A
detailed analysis of these and previous results suggests that the so
called 'meridional motions', found by spectroscopical means, mainly
originate from latitudinal effects on the convective line shift, which
might also be modulated by the activity cycle. This interpretation does
not exclude the fact that small meridional mass flows are present on
the sun, like those found from the tracers drifts.
Title: Long-term width and asymmetry variation of some Fe I
photospheric lines in solar quiet regions at the disk center.
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1986A&A...158..275C
Altcode:
Observations obtained in the years 1983 and 1984 at the Donati Solar
Tower in Arcetri show that at the disk center the asymmetry and width
of three Fe I photospheric lines show a long term variation. These
results are in agreement with previous full disk observations of
secular trends in asymmetry and equivalent width.
Title: Prospects for an orbital determination and capture cell
experiment
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.; Alamanni, N.
Bibcode: 1986A&A...156..310C
Altcode:
Recent measurements of the 7699 Å K I line by other authors have shown
that the line asymmetry, during the 5-min oscillations, varies in an
tiphase with the line shift. We have measured, at the center of the
solar disk, the bisector variations of three Fe I photospheric lines at
6297.8 Å, 6301.5 Å and 6302.5 Å. The oscillating power of the line
bisectors and of the line flanks is distributed in several modes, the
highest one is at 3.45mHz. The power decreases along the bisector from
the line core to the continuum, confirming previous results on the 7699
Å K I line. The oscillating power, at equal intensity levels in all
the three observed lines, is generally different in the two line flanks,
and it decreases differently from the line core to the continuum.
Title: Il seeing astronomico.
Authors: Righini, A.
Bibcode: 1986GAst...12....7R
Altcode:
No abstract at ADS
Title: Meridional and equatorial center-to-limb variation of the
asymmetry and shift of three Fe I solar photospheric lines around
6300 A
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1985A&A...150..256C
Altcode:
In this paper we describe an investigation on the center-to-limb
variation of the line asymmetry and shift along the polar and
equatorial diameters of the Sun, carried out on the Fe I photospheric
lines at 6297.8 Å, 6301.5 Å, and 6302.5 Å. In particular we aim at
ascertaining how much of the so called meridional motion is due to a
possible latitudinal dependence of the convection, and how much to real
large scale mass flows. The observations, obtained with the Fabry-Perot
spectrointerferometer installed at the Donati Solar Tower in Arcetri,
do not show any significant latitudinal effect on the line bisector
shapes. The results regarding the latitudinal dependence of the limb
shift are ambiguous.
Title: Shortterm Profile Variations of Photospheric Lines in Solar
Quiet Regions at the Disk Center
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1985tphr.conf...87C
Altcode:
No abstract at ADS
Title: Terrestrial O2 lines used as wavelength references Experimental
profiles and asymmetries vs. model computations
Authors: Caccin, B.; Cavallini, F.; Ceppatelli, G.; Righini, A.;
Sambuco, A. M.
Bibcode: 1985A&A...149..357C
Altcode:
In order to evaluate wind and pressure effects on telluric lines,
the profiles and the bisectors of four rotational lines of the
gamma band is compared with the results of detailed theoretical
calculations. The analysis is carried out using standard models of
the terrestrial atmosphere and the molecular data available in the
literature. In particular, a height-dependent pressure shift of the
line profile has been included in the calculations, leading to a
satisfactory agreement with the observations. The computer code for
line transfer in the earth's atmosphere correctly reproduces also the
profiles and the bisectors of the same lines obtained at the height of
the Jungfraujoch, as can be deduced from the Liege Atlas (Delbouille et
al., 1973). Finally, the line shifts observed by Balthasar et al. (1982)
are compared with line shifts computed with the present code, including
wind shifts and pressure shifts. It is found that the amount by which
the varying asymmetry of the lines may affect wavelength determinations
depends upon the definition of the line wavelength itself.
Title: Asymmetry and shift of three Fe I photospheric lines in solar
active regions.
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1985A&A...143..116C
Altcode:
The asymmetry and the red shift of three Fe I solar lines around 6300 A
have been measured in active regions with a Fabry-Perot spectrometer. At
the disk center, the active region line bisectors are always displaced
to the red and their shape is heavily modified. This red-shift nearly
compensates the convective blue-shift for strong magnetic fields,
suggesting that the inhibition of convection in magnetic regions
might be responsible for the red-shift instead of the often invoked
'downdraft'. Moving from the center to the limb, at about 0.56 solar
radii, the red-shift changes to a slight blue shift. This effect might
explain, without the need of invoking a poleward meridional flow,
why the center to limb red-shift of the line wavelengths is found to
be smaller along the solar equator than along the meridian on large
ensembles of data.
Title: The JOSO site testing campaigns in the Canary Islands
Authors: Brandt, P. N.; Righini, A.
Bibcode: 1985VA.....28..437B
Altcode:
In 1968 an informal cooperation of European solar research institutions
was established under the name of JOSO (Joint Organization for Solar
Observations). A brief account is given of the site testing carried out
by this organization to find an "ideal" solar observatory site. After
having tested nearly 40 sites in the Mediterranean and Atlantic coastal
areas, it was found that, notwithstanding the great homogeneity of the
maritime airmasses, coastal sites were not suitable for high resolution
solar observations. Consequently, in the search for mountain sites
imbedded in highly homogeneous air, two sites were chosen in the
Canary Islands: Izaña (Tenerife) and Roque de los Muchachos (La
Palma). Aircraft and radiosonde tests of the microthermal vertical
profile in the atmosphere have shown the superior homogeneity of the
Atlantic airmass above the Canary Islands. An extended test of 160
days (in 1979) of meteorological and solar observations performed
simultaneously with two telescopes, both photographically and with
photoelectric seeing monitors, has led to the conclusion that the Izaña
site is somewhat superior to the site at Roque de los Muchachos as
far as daytime seeing is concerned. Measurements during and after the
campaign have also shown that for certain periods during daytime the
telescopes installed at both sites appear to be inside the large-scale
airmass whose residual inhomogeneities limit the night-time seeing.
Title: Solar Two-Dimensional Spectroscopy with Universal Birefringent
Filters and Fabry-Perot Interferometers
Authors: Bonaccini, D.; Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1985LNP...233..118B
Altcode: 1985hrsp.proc..118B
A bidimensional solar spectrometer that utilizes a Fabry Perot
interferometer (FPI) and a universal birefringent filter (UBF) and
operates in the 4200-7000. A region of the spectrum is described. The
UBF is a chain of nine Lyot elements which are composed of a calcite or
quartz retarder plate, a lambda/4 achromatic wave plate, and an input
and output linear polarizer. The telecentric optical interference
of the system is examined. The high passband wings of the FPI are
analyzed; an FPI in double-pass configuration is proposed to lower
the FPI passband wings and improve its contrast.
Title: Short term profile variations of photospheric lines in solar
quiet regions at the disk center.
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.; Alamanni, N.
Bibcode: 1985MPARp.212...87C
Altcode:
The authors study short term profile variations of photospheric
lines. These asymmetry oscillations might put new constraints on the
modelling of the line asymmetry forming processes in presence of a
turbulent regimen.
Title: The JOSO site testing campaign: Techniques, results and
general considerations.
Authors: Brandt, P. N.; Righini, A.
Bibcode: 1985LFTR...11.....B
Altcode:
After a brief summary of the optical effects of atmospheric turbulence
a description is given of the non-optical and optical testing devices
and techniques used in the JOSO testing campaigns. The evolution of the
solar site testing concept is described, discussing why JOSO moved from
the coastal sites to the high level sites in the favourable climate
of the Canary Islands.
Title: Preliminary Results About the Bisector of 6301.5 Solar Line
in Active Regions
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1984ssdp.conf..334C
Altcode:
Preliminary results of the observations performed with the Fabry-Perot
spectrometer of the Arcetri Solar Tower show that the bisector of the
6301.5 Fe I solar line is red shifted and the C-shape is distorted in
active regions when compared with that obtained in quiet regions.
Title: Shifts and Asymmetric of Photospheric Lines (Keynote)
Authors: Righini, A.; Cavillini, F.; Ceppatelli, G.
Bibcode: 1984ssdp.conf..300R
Altcode:
The phenomenology of photospheric line shifts and asymmetries is
briefly reviewed as an observational constraint for any modeling of
fine convective structures in the photosphere of the Sun.
Title: Absolute measurement of the bisector of the 6301.5091 Fe I
line in the solar spectrum
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1982A&A...109..233C
Altcode:
In order to test whether differences in results about the shape of
the 6301.5091 Fe I solar line can be ascribed to temporal fluctuations
of the line asymmetry or to instrumental effects, measurements of the
absolute bisector of the line have been obtained with the Fabry-Perot
interferometer built at the Arcetri Solar Tower. The bisector agrees
with that previously obtained by Adam et al. (1976). The wavelength
of the line coincides with previous measurements, suggesting that, at
the disk center, the line is stable within 5 m/s for an integration
area of two arcmin. This result also shows that the three telluric
lines used as wavelength references are stable down to this limit.
Title: Lower atmosphere and solar seeing - an experiment of
simultaneous measurements of nearby turbulence by thermal radiosondes,
by angle of arrival statistics and image motion observation
Authors: Borgnino, J.; Ricort, G.; Ceppatelli, G.; Righini, A.
Bibcode: 1982A&A...107..333B
Altcode:
Simultaneous measurements of Fried's parameter as produced by the
lower atmospheric layers are shown to give the same results when using
both optical and thermal devices. Estimations of Fried's parameter are
obtained from the variance of angle-of-arrival fluctuations observed
with a 10-cm telescope, and these optical values are in good agreement
with those obtained from in situ soundings performed up to an altitude
of 700 m. The thermal soundings indicate that the turbulence is highly
stratified, although this stratification does not affect the results
of the optical monitor.
Title: Fabry Perot Interferometers for High Resolution Solar
Spectroscopy
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1981siwn.conf..243C
Altcode:
No abstract at ADS
Title: Solar oscillations
Authors: Cavallini, F.; Ceppatelli, G.; Righini, A.
Bibcode: 1980MmSAI..51..611C
Altcode:
Theoretical and observational problems in the study of solar
oscillations are reviewed. Consideration is given to models of solar
pulsations, for which accurate values of initial solar abundances
and a more complete knowledge of convective zone dynamics are
required. Measurements of variations in the solar diameter or the
radial velocity of the center of the solar disk are then discussed,
and arguments are presented in favor of the terrestrial origin of the
160-min solar oscillations. The importance of the study of short-period
(about 5 min) solar oscillations to theories of the solar convective
zone is also pointed out.
Title: Remote sensing of atmospheric turbulence by means of a fast
optical method - A comparison with simultaneous in situ measurements
Authors: Azouit, M.; Vernin, J.; Barletti, R.; Ceppatelli, G.; Righini,
A.; Speroni, N.
Bibcode: 1980JApMe..19..834A
Altcode:
In this paper we describe an experiment in which we measure the energy
of the atmospheric turbulence up to an altitude of 20,000 m. The
measurements have been performed simultaneously by a remote optical
system attached to an astronomical telescope and by a free flying
balloon-borne radiosonde carrying thermal sensors for detecting the
in situ microturbulence. The consistency of the results shows that
the ground based optical equipment for remote testing of atmospheric
turbulence is a reliable device for a fast, continuous measurement of
vertical profiles of turbulence.
Title: A Fabry Perot spectrometer for measuring solar velocity fields
Authors: Cavallini, F.; Ceppatelli, G.; Barletti, R.; Righini, A.
Bibcode: 1980A&A....85..255C
Altcode:
A solar spectrometer based on a Fabry-Perot interferometer has been
developed as an alternative to grating spectrometers for measuring solar
velocity fields. The spectrometer features high stability and provides
measurements of velocity fields down to 8 m/s over solar surface areas
up to two arcmin in diameter. Wavelength drifts of the system are slow
and predictable, and the results may be rectified by a continuous test
of the interferometer thickness with a standard wavelength source. Data
obtained on the bisector of the 6301.508 Fe I line are reported.
Title: Future Solar and Optical Observations Needs and Constraints
Authors: Godoli, G.; Noci, G.; Righini, A.
Bibcode: 1980fsoo.conf.....G
Altcode:
No abstract at ADS
Title: Report from the discussion group on two dimensional
spectroscopy
Authors: Righini, A.; Rutten, R. J.
Bibcode: 1980fsoo.conf..308R
Altcode:
No abstract at ADS
Title: Seeing problems
Authors: Ceppatelli, G.; Righini, A.
Bibcode: 1980fsoo.conf...72C
Altcode:
No abstract at ADS
Title: Turbulence around a solar telescope as deduced from angle of
arrival statistics. A comparison with microthermal measurements.
Authors: Borgnino, J.; Azouit, M.; Barletti, R.; Ceppatelli, G.;
Paternò, L.; Righini, A.; Speroni, N.; Vernin, J.
Bibcode: 1979A&A....79..184B
Altcode:
Summary. Optically deduced nearby turbulence profiles are compared
with thermal profiles secured with radiosondes. Good agreement is
observed as far as the distribution of turbulent energy is concerned
up to two hundred meters along the line of sight. The differences
observed between the optical and thermal value of the turbulence
total energy, may be interpreted assuming that optical and "in situ"
soundings partially detect the same turbulence in the lowest layers,
but that a strong turbulence is present at heights above two hundred
meters, reached only by the optical method. Key words: site testing -
atmospheric turbulence - solar seeing
Title: Proceedings of the JOSO workshop: Future solar optical
observations - needs and constraints. Firenze, November 7 - 10, 1978.
Authors: Godoli, G.; Noci, G.; Righini, A.; Pacini, F.; Engvold, O.;
Harvey, J. W.
Bibcode: 1979MmArc.106....1G
Altcode:
No abstract at ADS
Title: Report from the discussion on two-dimensional spectroscopy
requirements for Lest (Large European Solar Telescope).
Authors: Righini, A.; Rutten, R. J.
Bibcode: 1979MmArc.106..308R
Altcode:
No abstract at ADS
Title: Seeing problems.
Authors: Ceppatelli, G.; Righini, A.
Bibcode: 1979MmArc.106...72C
Altcode:
No abstract at ADS
Title: Report from the discussion group on two dimensional
spectroscopy
Authors: Righini, A.; Rutten, R. J.
Bibcode: 1978fsoo.conf..308R
Altcode:
No abstract at ADS
Title: Seeing problems
Authors: Ceppatelli, G.; Righini, A.
Bibcode: 1978fsoo.conf...72C
Altcode:
No abstract at ADS
Title: Daytime r0 evaluated from vertical microthermal
measurements
Authors: Barletti, Raffaele; Ceppatelli, Guido; Paternò, Lucio;
Righini, Alberto; Speroni, Neri
Bibcode: 1977ApOpt..16.2419B
Altcode:
The usefulness of parameter r sub 0 for describing the effect of
atmospheric turbulence on wavefront distortion sensitive optical systems
has been widely discussed. This paper presents in situ daytime r sub 0
measurements (5500 A, Zenith propagation) obtained from balloon-borne
microthermal radiosondes. It is found that the parameter r sub 0
is log normal distributed at various levels aloft and that r sub 0
follows a power law in the 100-10,000-m range. Comparing these results
with nighttime ground based observations it is concluded that local
turbulence prevails in determining image quality.
Title: Astronomical site testing with balloon borne radiosonde:
Results about atmospheric turbulence, solar seeing and stellar
scintillation.
Authors: Barletti, R.; Ceppatelli, G.; Paterno, L.; Righini, A.;
Speroni, N.
Bibcode: 1977A&A....54..649B
Altcode:
The paper summarizes the results of radiosonde measurements of
atmospheric turbulence up to 20,000 m and stellar scintillation and
solar seeing measurements at three possible astronomical observation
sites. Two of the sites are in the Canary Islands and are imbedded in
large homogeneous air masses, and the other site is an island off the
coast of Portugal, where continental winds at intermediate heights
introduce turbulent air masses between two undisturbed layers. The
Canary Island sites appear to have the best qualifications for
high-resolution solar observations. Good correlation was established
between stellar scintillation and atmospheric turbulence, so that
inexpensive scintillation measurements could be used to estimate
daytime seeing.
Title: Attrezzatura strumentale dell'Osservatorio de Arcetri.
Authors: Cantù, A.; Ceppatelli, G.; Landini, M.; Righini, A.;
Tofani, G.
Bibcode: 1977GAst....3..203C
Altcode:
No abstract at ADS
Title: Mean vertical profile of atmospheric turbulence relevant for
astronomical seeing
Authors: Barletti, Raffaele; Ceppatelli, Guido; Paterno, Lucio;
Righini, Alberto; Speroni, Neri
Bibcode: 1976JOSA...66.1380B
Altcode: 1976OSAJ...66.1380B
No abstract at ADS
Title: H and K (Ca II) emissions as observed in coronal spectrum in
the July 20, 1963 solar eclipse
Authors: Cavallini, F.; Righini, A.
Bibcode: 1975SoPh...45..291C
Altcode:
From a detailed analysis of a coronal spectrum taken from a DC-8 jet
airplane during the Eclipse of 20 July, 1963 a rough model of a coronal
cold region (T ≈ 105 K) has been obtained.
Title: Proceedings of the First European Solar Meeting. Florence,
February 25 - 27, 1975.
Authors: Chiuderi, C.; Landini, M.; Righini, A.; Zwaan, C.
Bibcode: 1975MmArc.105....1C
Altcode:
No abstract at ADS
Title: CESRA-5
Authors: Chiuderi, C.; Landini, M.; Righini, A.
Bibcode: 1975cesra...5.....C
Altcode:
No abstract at ADS
Title: High-resolution optical astronomy and atmospheric
microturbulence
Authors: Barletti, R.; Ceppatelli, G.; Moroder, E.; Paterno, L.;
Righini, A.
Bibcode: 1974RIG....23..264B
Altcode:
In this paper the geophysical aspects of the Italian JOSO site testing
campaigns are described. JOSO is a European organization of solar
physicists who try to find in the European area a site with very low
atmospheric turbulence, which limits the maximum attainable resolution
in solar observations from the ground. The results obtained during
these site testing campaigns with ground based measurements and balloon
borne radiosondes are presented.
Title: The Evaluation of Night Time Seeing from Polar Star Trails
Authors: Moroder, E.; Righini, A.
Bibcode: 1973A&A....23..307M
Altcode:
Summary. In this paper, using the theory of propagation of
electromagnetic waves in turbulent media and the results of Fourier
Optics, the Resolving Power of large telescopes is evaluated from
image motion as measured on the polar trails obtained with small size
site testing telescopes. Key words: seeing - atmospheric optics -
site testing techniques
Title: Evaluation of the image quality at the Arcetri Solar Tower:
I. The effects of the turbulence in the telescope
Authors: Ceppatelli, G.; Righini, A.
Bibcode: 1973MmSAI..44..193C
Altcode:
No abstract at ADS
Title: JOSO site campaigns in Lampedusa and Lampione
Authors: Ceppatelli, G.; Righini, A.; Barletti, R.; Meco, M.;
Paloschi, S.
Bibcode: 1973MmArc.102....1C
Altcode: 1973PUFir.102.....C
No abstract at ADS
Title: Modulation Transfer Function for Solar Telescopes and
Atmospheric Turbulence
Authors: Righini, Alberto
Bibcode: 1972SoPh...25..242R
Altcode:
Results on the structure coefficient of the temperature field present
in the low atmosphere are presented. Measurements have been performed
during the national Italian expedition for solar site testing in Isola
delle Correnti (southern Sicily).
Title: Seeing astronomico e fluttuazioni microtermiche dell'atmosfera
(Rassegna)
Authors: Ceppatelli, G.; Righini, A.
Bibcode: 1972MmSAI..43..389C
Altcode:
No abstract at ADS
Title: Considerazioni su alcuni risultati della campagna JOSO 71 a
Izana, Tenerife
Authors: Ceppatelli, G.; Righini, A.
Bibcode: 1972MmSAI..43..123C
Altcode:
No abstract at ADS
Title: Considerazioni sulla classificazione visuale delle tracce
di Walker
Authors: Moroder, R.; Righini, A.
Bibcode: 1972MmSAI..43..535M
Altcode:
No abstract at ADS
Title: La spedizione JOSA all'isola di Lampione nel settembre 1971.
Authors: Ceppatelli, G.; Righini, A.
Bibcode: 1972Coel...40...43C
Altcode:
No abstract at ADS
Title: Taratura di due filtri interferenziali tipo Lyot-Öhman
Authors: Baldini, R.; Grisendi, T.; Mazzucconi, F.; Righini, A.
Bibcode: 1972MmSAI..43..105B
Altcode:
No abstract at ADS
Title: Isodensitometric Analysis of flare on 1966, March 20
Authors: Mazzucconi, F.; Righini, A.
Bibcode: 1971SoPh...17..174M
Altcode:
We describe the behaviour of the McMath A.R. No. 8207 from the
photometric point of view during the remarkable flare of 20 March,
1966. The results of the photometry are compared with the radio and
Ly-α emission.
Title: Analisi preliminare sulla qualità dell'immagine solare alla
cupola "Amici" dell'Osservatorio Astrofisico di Arcetri (Lettera
alla Direzione)
Authors: Mazzucconi, F.; Righini, A.
Bibcode: 1971MmSAI..42..229M
Altcode:
No abstract at ADS
Title: Attività di "site testing" dell'Italia nell'ambito della
Joint Organization for Solar Observatory (JOSO).
Authors: Righini, A.
Bibcode: 1971RSAI...14..157R
Altcode:
No abstract at ADS
Title: Attività di « Site testing » dell'Italia nell'ambito della
Joint Organization for Solar Observatory
Authors: Righini, A.
Bibcode: 1971sai....14..157R
Altcode:
No abstract at ADS
Title: Temporal correlation between flares and surges (Lettera
alla Direzione)
Authors: Mazzucconi, F.; Righini, A.
Bibcode: 1970MmSAI..41..243M
Altcode:
No abstract at ADS
Title: An optical system for monochromatic photography of the
electron corona.
Authors: Kissell, K. E.; Morais, C.; Righini, A.; Righini, G.
Bibcode: 1970ApOpt...9.2620K
Altcode:
No abstract at ADS
Title: Analisi micrometeorologica della torre solare di Arcetri
(Lettera alla Direzione)
Authors: Righini, A.
Bibcode: 1969MmSAI..40..355R
Altcode:
No abstract at ADS
Title: The design of optical spectrometers (Recensione)
Authors: Righini, A.
Bibcode: 1969MmSAI..40..107R
Altcode:
No abstract at ADS
Title: L'école internationale d'été sur le traitement optique
d'information (Congressi e Simposi)
Authors: Ceppatelli, G.; Righini, A.
Bibcode: 1969MmSAI..40..359C
Altcode:
No abstract at ADS
Title: Report on the Pachino solar site testing.
Authors: Blanco, C.; Godoli, G.; Paternò, L.; Righini, A.; Rodonò, M.
Bibcode: 1969PCat..142.....B
Altcode:
No abstract at ADS
Title: L'interferometro Fabry-Pérot per l'analisi fotometrica dei
profili di righe solari
Authors: Righini, A.
Bibcode: 1969MmSAI..40..475R
Altcode:
No abstract at ADS
Title: Analysis of Some Solar Flares from Optical, X-Ray and Radio
Observations
Authors: Falciani, R.; Landini, M.; Righini, A.; Rigutti, M.
Bibcode: 1968IAUS...35..451F
Altcode:
No abstract at ADS
Title: Organizzazione, programmi e strumenti del gruppo ottico
installato a Bagé (Brasile).
Authors: Falciani, R.; Righini, A.; Rigutti, M.
Bibcode: 1968MmArc..86...23F
Altcode:
No abstract at ADS
Title: Zdneck Kopal: An introduction to the study of the moon
(Recensione)
Authors: Righini, A.
Bibcode: 1967MmSAI..38..449R
Altcode:
No abstract at ADS
Title: Solar abundances of some rare earths
Authors: Righini, A.; Rigutti, M.
Bibcode: 1967lts..conf..121R
Altcode:
No abstract at ADS
Title: Photometric Analysis of Solar Flares
Authors: Falciani, R.; Righini, A.; Rigutti, M.
Bibcode: 1967ZA.....67..481F
Altcode:
No abstract at ADS
Title: Ricerche tecnologiche e risultati pratici su alcuni metodi
fotografici impiegati sulla isodensitometria di sorgenti estese
Authors: de Gregorio, P.; Falciani, R.; Righini, A.; Rigutti, M.
Bibcode: 1967MmSAI..38...33D
Altcode:
No abstract at ADS
Title: Coronal isophotes from the solar eclipse of November 12, 1966
Authors: Falciani, R.; Righini, A.; Rigutti, M.
Bibcode: 1967MmSAI..38..721F
Altcode:
No abstract at ADS
Title: Studio comparato di alcune emulsioni fotomeccaniche e di
alcuni rivelatori in relazione alle applicazioni nell'isodensitometria
fotografica
Authors: de Gregorio, P.; Falciani, R.; Righini, A.; Rigutti, M.
Bibcode: 1967MmSAI..38..531D
Altcode:
No abstract at ADS
Title: La luminescenza lunare Title: La luminescenza lunare Title:
Lunar luminescence.
Authors: Righini, A.; Rigutti, M.
Bibcode: 1967Coel...35...44R
Altcode:
No abstract at ADS
Title: Alcune applicazioni del metodo delle isodense fotografiche
in spettroscopia
Authors: de Gregorio, P.; Falciani, R.; Righini, A.; Rigutti, M.
Bibcode: 1967MmSAI..38..519D
Altcode:
No abstract at ADS
Title: Relazione sull'eclisse totale DI sole del 12 novembre 1966
Authors: Righini, Guglielmo; Falciani, Roberto; Righini, A.; Rigutti,
Mario; Piattelli, M.; Tofani, G.
Bibcode: 1967MmArc..86....1R
Altcode: 1967PUFir..86.....R
No abstract at ADS
Title: La spedizione dell'osservatorio di Arcetri per l'osservazione
ottica dell'eclisse anulare di sole del 20 Maggio 1966 a Saronis
Authors: Falciani, R.; Righini, A.; Rigutti, M.
Bibcode: 1967sai....10....1F
Altcode:
No abstract at ADS
Title: Note on lunar luminescence
Authors: Righini, A.; Rigutti, M.
Bibcode: 1967adxc.proc..285R
Altcode:
No abstract at ADS
Title: Note sulla luminescenza lunare
Authors: Righini, A.; Rigutti, M.
Bibcode: 1967sai....10..285R
Altcode:
No abstract at ADS
Title: Solar abundances of somme 4f type rare earths
Authors: Righini, A.; Rigutti, M.
Bibcode: 1966AnAp...29..379R
Altcode:
No abstract at ADS
Title: Lettera alla Direzione: Uso delle isodense fotografiche per
studi fotometrici di alcuni fenomeni solari
Authors: de Gregorio, P.; Falciani, R.; Righini, A.; Rigutti, M.
Bibcode: 1966MmSAI..37..807D
Altcode:
No abstract at ADS
Title: Some results of research on lunar luminescence
Authors: Righini, A.; Rigutti, M.
Bibcode: 1966Icar....5..258R
Altcode:
Research on lunar luminescence has been done with a technique similar to
that illustrated by Kopal and Rackham in the period from November 1964
to January 1965. No luminescence phenomena have been observed, but the
analysis of the observations has pointed out that some precautions must
be taken in order to obtain reliable photographic observations. Also
pointed out is the necessity of systematic observations during a
long period of time, possibly a solar cycle, in order to clarify the
characteristics of the suspected relation between solar activity and
lunar luminescence.
Title: Isofote della corona del 30 Maggio 1965
Authors: Righini, A.
Bibcode: 1966MmSAI..37..583R
Altcode:
No abstract at ADS
Title: Lettera alla Direzione - "N. A. T. O. Advanced Study Institute
on solar physics"
Authors: Falciani, R.; Righini, A.
Bibcode: 1965MmSAI..36..505F
Altcode:
No abstract at ADS