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Author name code: rodriguez-hidalgo
ADS astronomy entries on 2022-09-14
author:"Rodriguez Hidalgo, Ines"
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Title: “May infinity be left without stars”. Dissemination of
Astronomy from planetariums and science museums
Authors: Rodríguez Hidalgo, I.
2019hsax.conf..646R Altcode:
The title (borrowed from a famous bolero) is not so exaggerated when
we remember that more than twenty five planetariums, scattered about
the Spanish territory, do “ex officio” the magic of making the stars
accessible to the public. They are unique spaces that simulate, in a
very realistic way, the celestial vault as seen from different places
and dates, giving back to their visitors the emotion of gazing at
a night sky free of light pollution. They can also project fulldome
programs of astronomical content. Therefore, planetariums turn into
valuable tools for the teaching and dissemination of Astronomy. At the
same time, more than twenty Spanish science museums, with or without
planetarium, bring Astronomy closer to the public of all ages and
backgrounds through numerous and varied activities. This paper aims to
be a meeting between the Spanish professional astronomers and those
essential allies in the dissemination of Astronomy. The last ones
offer intelligent fun and unforgettable experiences, transmitting
basic knowledge and showcasing the latest advances. They definitely
contribute to promote vocations and to educate society in positive
attitudes towards Astronomy and Science in general.
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Title: Confieso que Divulgo. Reflexiones y Experiencias de una
Astrofísica
Authors: Rodríguez Hidalgo, I.
2010ASSP...14..241R Altcode: 2010hsa5.conf..241R
Este artículo presenta algunas reflexiones en torno a la
popularización de la Ciencia, desarrolladas a lo largo de mi
trayectoria profesional, un camino inacabado desde la intuición
al oficio. Tras revisar las señas de identidad de la divulgación
científica, se exponen ideas, experiencias y recursos, cribados
por la práctica y su posterior análisis crítico. Se destacan las
actividades relacionadas con la Astronomía, que se cuentan entre las
más espectaculares y gratificantes. Confessions of a popularizer:
This paper presents some author's thoughts about scientific outreach,
developed along her professional path, an unfinished way from intuition
to trade. First, identity signs of outreach are revised; then, ideas,
experiences and resources, sifted by practice and further critical
analysis, are reviewed. Activities related to Astronomy, being one of
the most spectacular and rewarding, are remarked <SUP>1</SUP>
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Title: Meteorite, a rock from space: A planetarium adventure for
children
Authors: Rodríguez Hidalgo, I.; Naveros Y Naveiras, R.; González
Sánchez, O.
2008ca07.conf..508R Altcode:
At the Museum of the Science and the Cosmos (MCC, La Laguna, Tenerife)
there is a small planetarium. All the different planetarium shows are
carried out entirely by the Museum staff, from the original idea and
the script to the final production. In February 2007, Meteorite, a rock
from space, a new show, specifically for children, was released. The
characters (astronomical bodies) are played by puppets, designed and
manufactured for this occasion; the script has been carefully written,
and introduces many astronomical concepts in the form of an entertaining
tale, which encourages the children to participate by crying, counting,
helping the characters - just like a traditional puppet show. The aim
of this contribution is to review the different resources (some of
them really innovative) used to create this programme, which offers
plenty of future possibilities.
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Title: Do the Stars Tell Your Love Story?
Authors: Rodriguez Hidalgo, I.
2005ca05.conf..152R Altcode:
A good alternative to traditional methods of passing on astronomical
concepts is to use a 'collateral' story that catches the public's
attention. It may also simultaneously give a vital opportunity to
awaken the critical faculty that often seems so perilously close to
extinction these days. The recipe is simple: nothing but an actor
or actress, his/her voice and hands, and a script on a topic of wide
popular interest, with bits of magic and humour. A live example was
shown during the Meeting (see the webcast). The text of that performance
is presented in this paper, followed by an analysis and discussion of
the proposed resource.
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Title: Time for Space: Five Minutes a Week for Astronomy
Authors: Rodriguez Hidalgo, Inés
2005coas.conf..172R Altcode:
No abstract at ADS
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Title: Outreach and the Professional Astronomer: a Survey of Attitudes
Authors: Diaz Vilela, Luis; Rodriguez Hidalgo, Inés
2005coas.conf..107D Altcode:
No abstract at ADS
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Title: Outreach as seen by the Spanish professional astronomers:
a survey of beliefs, attitudes, and activities
Authors: Rodríguez Hidalgo, I.; Díaz Vilela, L. F.
2005EAS....16...81R Altcode:
A survey of outreach related beliefs, attitudes, and activities of the
Spanish professional astronomers is presented. More than one hundred
scientists answered an ad-hoc drawn up questionnaire, whose results
have been analysed statistically. This feedback form is an improved
version of that used in a previous research carried out by the authors
with a sample of members of the Instituto de Astrofísica de Canarias
(Díaz Vilela & Rodríguez Hidalgo 2005). Some of the studied items
are the actual time and effort devoted to outreach by a researcher,
the role of outreach within his work, the valuation of outreach
activities in his curriculum, socially, or economically, the opinion
about who should have the responsibility of organising and performing
popularisation tasks, etc. Three kinds of studies have been performed:
the descriptive one is based on the frequencies and means of variables;
a Principal Component Analysis was applied to get a shorter number
of belief-attitude dimensions; and an inferential one, derived from
a Multiple Regression Analysis which provides a reliable description
of the beliefs-attitudes scale grouping outreach related beliefs into
6 components, 3 of them more significant. A simple regression allows
us to predict about a 50% of the variance of the outreach practices.
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Title: Getting Photometric Spatial Resolution from 2-D
Spectropolarimetric Data
Authors: Rodríguez Hidalgo, I.; Ruiz Cobo, B.
2003ASPC..307..145R Altcode:
No abstract at ADS
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Title: Recent advances and future projects in solar instrumentation
at the Instituto de Astrofísica de Canarias
Authors: Rodríguez Hidalgo, Inés
2002ESASP.477..593R Altcode: 2002scsw.conf..593R
The main advances in instrumentation for Solar Physics during the past
year at the Instituto de Astrofisica de Canarias (IAC) are reviewed. In
addition, some exciting new projects for the future are presented,
like building an imaging magnetograph to fly on board Sunrise,
IMaX. This contribution has been presented within the Meeting on New
Solar Instrumentation corresponding to the annual session of the JOSO
Working Group 2.
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Title: JOSO national report 2000-2001 - Spain. (Solar physics
in Spain)
Authors: Rodríguez Hidalgo, I.
2002joso.book..103R Altcode:
The most relevant advances and developments of the Solar "activity"
in Spain during the last two years are reviewed, classified according
to the different institutes and universities where solar research is
carried out.
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Title: Observation of Convective Collapse and Upward-moving Shocks
in the Quiet Sun
Authors: Bellot Rubio, Luis R.; Rodríguez Hidalgo, Inés; Collados,
Manuel; Khomenko, Elena; Ruiz Cobo, Basilio
2001ApJ...560.1010B Altcode:
We present spectropolarimetric evidence of convective collapse
and destruction of magnetic flux by upward-moving fronts in the
quiet Sun. The observational material consists of time series of
the full Stokes vector of two infrared spectral lines emerging from
regions associated with Ca II K network points. The amplitude of the
circular polarization profiles of a particular spatial point is seen to
increase while the profiles are redshifted. It then decreases during
a much shorter phase characterized by large blueshifts. Inspection
of the data indicates that the blueshift occurs because of the sudden
appearance of a new, strongly displaced Stokes V profile of the same
polarity. The amplification of the magnetic signal takes place in a
time interval of about 13 minutes, while blueshifts and the concomitant
decreasing Stokes V amplitudes last for only 2 minutes. An inversion
code based on the thin flux-tube scenario has been applied to the data
in order to derive the thermal, magnetic, and dynamic structures of
the atmosphere. According to our results, the field strength undergoes
a moderate increase from 400 to 600 G at z=0 km during the phase in
which redshifts are present. The observed redshifts are produced by
internal downflows of up to 6 km s<SUP>-1</SUP> at z=0 km. After ~13
minutes, the material falling down inside the tube appears to bounce
off in the deeper layers, originating an upward-propagating front whose
manifestation on the Stokes V profiles is a large blueshift. The front
moves with a speed of 2.3 km s<SUP>-1</SUP> and has a downflow-to-upflow
velocity difference of about 7 km s<SUP>-1</SUP> initially and some
4 km s<SUP>-1</SUP> after 2 minutes. It strongly weakens the magnetic
field strength and may be responsible for the complete destruction of
the magnetic feature. The observed behavior is in general agreement
with theoretical predictions of flux expulsion, convective collapse,
and development of shocks within magnetic flux tubes.
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Title: Lagrangian and Eulerian Stratifications of Acoustic
Oscillations through the Solar Photosphere
Authors: Rodríguez Hidalgo, Inés; Ruiz Cobo, Basilio; Collados,
Manuel; Bellot Rubio, Luis R.
2001ApJ...547..491R Altcode:
We evaluate the stratification of acoustic oscillations in the solar
photosphere in both the Lagrangian (comoving) frame of reference and
the Eulerian (inertial) frame of reference, from a temporal sequence
of model atmospheres in an optical depth scale obtained after a
quasi-non-LTE inversion of the radiative transfer equation applied to
spectral observations of the K I 7699 Å line. Our results suggest
that, to first order, the photosphere moves up and down as a whole
with amplitudes ranging from ~8 km in deep layers (around 0 km) to ~19
km in the upper layers (around 640 km). In Lagrangian coordinates, we
observe numerous short-lived, local temperature and velocity amplitude
enhancements in medium-high layers, together with asymmetric waveforms
in the oscillation of these two physical quantities. The Lagrangian
temperature oscillation clearly shows two nodes associated with sharp
phase jumps of about 180°, whereas the velocity amplitude shows
the well-known increase with geometrical height, at nearly constant
phase. In Eulerian coordinates, the perturbations are dominated by
the coherent oscillation of the entire photosphere.
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Title: Photospheric acoustic oscillations in a Langrangian reference
system
Authors: Rodríguez Hidalgo, I.; Ruiz Cobo, B.; Collados Vera, M.;
Bellot Rubio, L. R.
2001ESASP.464..239R Altcode: 2001soho...10..239R
The stratification of acoustic oscillations through the solar
photosphere in Lagrangian (comoving) coordinates has been evaluated from
a quasi-NLTE inversion of the radiative transfer equation (RTE) applied
to a temporal sequence of K I 7699 Å line spectra. The stratifications
of amplitude and phase of the temperature and line-of-sight (LOS)
velocity Lagrangian oscillations have been evaluated. Our results
suggest that, to first order, the photosphere moves up and down as a
whole with amplitudes ranging from ~8 km in deep layers (around 0 km)
to ~19 km in the upper layers (around 640 km). Numerous short-lived,
local temperature and velocity amplitude enhancements in medium-high
layers are observed, together with an asymmetric waveform in the
oscillation of these two physical quantities. Two nodes are clearly seen
in the Lagrangian temperature oscillation run, which are associated with
sharp phase jumps of about 180°. The velocity amplitude shows the well
known increase with geometrical height, keeping practically in phase.
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Title: Oscillations in the Photosphere of a Sunspot Umbra from the
Inversion of Infrared Stokes Profiles
Authors: Bellot Rubio, L. R.; Collados, M.; Ruiz Cobo, B.; Rodríguez
Hidalgo, I.
2000ApJ...534..989B Altcode:
We report on the detection of magnetic field strength and velocity
oscillations in the photosphere of a sunspot umbra. Our analysis is
based on the inversion of the full Stokes vector of three Fe I lines
at 15650 Å, from which the stratification with optical depth of the
different atmospheric parameters has been derived. This allows us to
estimate the amplitude of the oscillations and the phase lag between
the fluctuations in the line-of-sight velocity and field strength. Our
results suggest that the inferred magnetic field oscillations are caused
by opacity fluctuations that move upward and downward the region where
the spectral lines are sensitive to magnetic fields.
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Title: Recent Developments in Solar Instrumentation at the Instituto
de Astrofisica de Canarias
Authors: Rodríguez-Hidalgo, I.
2000ESASP.463..623R Altcode: 2000sctc.proc..623R
No abstract at ADS
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Title: Recent Instrumental Developments in Solar Physics at the
Instituto de Astrofisica de Canarias
Authors: Rodríguez Hidalgo, I.
1999ESASP.448.1305R Altcode: 1999mfsp.conf.1305R; 1999ESPM....9.1305R
No abstract at ADS
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Title: The Last Total Eclipse of the Millennium as Seen by Shelio99
Authors: Rodríguez Hidalgo, I.; Abajas, C.; Shelios99 Team
1999ESASP.448.1295R Altcode: 1999mfsp.conf.1295R; 1999ESPM....9.1295R
No abstract at ADS
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Title: Formation and Destruction of a Weak Magnetic Feature in the
Solar Photosphere
Authors: Khomenko, E.; Collados, M.; Bellot Rubio, L. R.; Rodríguez
Hidalgo, I.; Ruiz Cobo, B.
1999ESASP.448..307K Altcode: 1999mfsp.conf..307K; 1999ESPM....9..307K
No abstract at ADS
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Title: Velocity and Temperature 5 Minute Oscillations as Functions
of Geometrical Height in the Photosphere
Authors: Rodríguez Hidalgo, I.; Ruiz Cobo, B.; Collados, M.
1999ASPC..184..176R Altcode:
The stratification with geometrical height of the velocity and
temperature 5 minute oscillation through the solar photosphere is
obtained after the inversion of a time series of KI 7699 Å line
spectra taken at disk center.
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Title: Quiet and Active Granulation Properties
Authors: Manso Sainz, R.; Rodríguez Hidalgo, I.; Collados, M.
1999ASSL..239..197M Altcode: 1999msa..proc..197M
The preliminary results of a classical spectroscopic analysis of a
facular region at mu=0.78 of ~100 arcsec x 50 arcsec are presented. The
variation with magnetic activity of several spectroscopic parameters
has been studied, showing clear evidence that granulation properties
are modified.
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Title: Granular and Intergranular Model Atmospheres from Inversion
of Solar Two-Dimensional Spectroscopic Data
Authors: Rodríguez Hidalgo, I.; Ruiz Cobo, B.; Collados, M.; del
Toro Iniesta, J. C.
1999ASPC..173..313R Altcode: 1999sstt.conf..313R
No abstract at ADS
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Title: TIP (Tenerife Infrared Polarimeter): a near IR full Stokes
Polarimeter for the German Solar Telescopes at Observatorio del Teide
Authors: Collados, M.; Rodríguez Hidalgo, I.; Bellot Rubio, L.;
Ruiz Cobo, B.; Soltau, D.
1999AGAb...15Q..11C Altcode: 1999AGM....15..A13C
In this contribution, the main characteristics of the=20 Tenerife
Infrared Polarimeter (TIP), recently built at the Instituto de
Astrofísica de Canarias, to be operated at the German Solar
Telescopes (GCT and VTT) of the Observatorio del Teide (Tenerife)
are presented. Especial emphasis is put on the modulation scheme,
polarisation efficiencies, signal-to-noise ratio, spatial and spectral
resolution, and instrumental polarisation cross-talk. Some examples
of data recently obtained are presented, which give an idea of the
performance and capabilities of this instrument.
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Title: Thermodynamical properties of granulation in active regions.
Authors: Rodríguez Hidalgo, I.; Collados, M.; Manso Sainz, R.;
Barkler, J.
1999joso.proc..195R Altcode:
A two-dimensional spectroscopic study of two solar active regions
is presented. A magnetic filling factor has been defined, and a new
technique to separate large and small spatial scale motions has been
used. Different types of features in the fields of view have been
classified according to their magnetic and convective properties,
and have been analysed with varying magnetic activity.
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Title: Oscillations in a sunspot umbra from the inversion of infrared
Stokes profiles
Authors: Bellot Rubio, Luis R.; Collados, Manuel; Ruiz Cobo, Basilio;
Rodríguez Hidalgo, Inés; Bogdan, Thomas J.
1999AGM....15..A07B Altcode:
We report on the detection of magnetic field strength and velocity
oscillations in the photosphere of a sunspot umbra. Our analysis is
based on the inversion of the full Stokes profiles of three Fe I lines
at 15650 Å, from which the stratification with optical depth of the
different atmospheric parameters has been derived. This allows us to
estimate the amplitude of the oscillations and the phase lag between
the fluctuations in the line-of-sight velocity and field strength. Our
results suggest that the inferred magnetic field oscillations are caused
by opacity fluctuations that move upward and donward the region where
the spectral lines are sensitive to magnetic fields.
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Title: Stratification with Optical Depth of the 5 Minute Oscillation
through the Solar Photosphere
Authors: Ruiz Cobo, Basilio; Rodríguez Hidalgo, Inés; Collados,
Manuel
1997ApJ...488..462R Altcode:
An analysis of the 5 minute oscillation in the solar photosphere
has been carried out using an inversion of the radiative transfer
equation applied to a time-series of K I λ7699 line spectra with
a 5" × 5" window at disk center. A thorough discussion of the
inversion conditions, with special emphasis on the LTE approach
and a careful error treatment, is offered. The inversion has been
performed introducing fixed non-LTE departure coefficients taken from
the literature. A sequence of instantaneous model atmospheres has been
obtained, reliable from log τ ~= 0 to log τ ~= -3.5. From the temporal
power spectra of line-of-sight velocity and temperature fluctuations,
the amplitude and phase stratifications of the oscillations of these
magnitudes have been obtained as functions of the optical depth. The
amplitude accuracies are better than 4 m s<SUP>-1</SUP> and 2 K in
most of the photosphere. The increase of the velocity oscillation
amplitude toward higher photospheric layers has been confirmed and
quantified. Its phase angle remains constant through the photosphere,
and significant power is obtained in temperature.
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Title: Stratification of the 5-min oscillation through the solar
photosphere
Authors: Rodríguez Hidalgo, I.; Ruiz Cobo, B.; Collados, M.
1997SoPh..172...77R Altcode: 1997ESPM....8...77R
The inversion of the radiative transfer equation has been applied to a
time series of low spatial resolution Ki 7699 Å line spectra, allowing
us to obtain a sequence of instantaneous models which are compared
to the mean one to derive the 5-min oscillation stratification. The
resulting models are reliable from log τ ≃ 0 to log τ ≃
-3.5. The increase of the velocity oscillation amplitude towards higher
photospheric layers has been confirmed and quantified. Significant
oscillation is observed in temperature.
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Title: Two-dimensional, high spatial resolution, solar spectroscopy
using a correlation tracker. I. Correlation tracker description.
Authors: Ballesteros, E.; Collados, M.; Bonet, J. A.; Lorenzo, F.;
Viera, T.; Reyes, M.; Rodriguez Hidalgo, I.
1996A&AS..115..353B Altcode:
In this paper the description of the Solar Correlation Tracker prototype
built by the Instituto de Astrof isica de Canarias is presented. The
system is mainly conceived as a solar image tranquilizer, although a
scanning utility has also been included in order to displace the image
on the final focal plane with sub-arcsecond steps, thus allowing to
perform two-dimensional high spatial resolution spectroscopy. The
behaviour of the different elements of the tracker is shown,
as well as their influence in the performance of the system. The
restrictions of the Absolute Differences algorithm, used to detect
image motion when granulation fields are considered, are extensively
discussed. Laboratory and telescope tests have demonstrated the
capabilities of the system. The electronic components have been adapted
to new optics and mechanics developed at the Kiepenheuer Institut to
build an Advanced Solar Correlation Tracker. The final version of the
system has been installed at the German VTT of the Spanish Observatorio
del Teide. The tests carried out have demonstrated that a bandwidth
of about 60Hz (for an attenuation factor of two) is achieved, which
is approximately four times larger than that of previous Correlation
Trackers, at the same level of attenuation.
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Title: Two-dimensional, high spatial resolution, solar spectroscopy
using a Correlation Tracker. II. Maps of spectral quantities.
Authors: Collados, M.; Rodriguez Hidalgo, I.; Ballesteros, E.; Ruiz
Cobo, B.; Sanchez Almeida, J.; del Toro Iniesta, J. C.
1996A&AS..115..367C Altcode:
In this paper we illustrate some of the capabilities of the Correlation
Tracker prototype developed at the Instituto de Astrofisica de
Canarias used for two-dimensional, high spatial resolution, solar
spectroscopy. Slit spectra have been taken, using the Correlation
Tracker as a stabilizer (minimizing image motion during exposures) and
as an accurate positioning device (allowing to precisely locate the
entrance slit of the spectrograph at adjacent positions on the solar
disc). Spectral information is obtained from several solar regions
of different sizes. Granules (including some exploding ones) and
intergranules are clearly resolved. Several sub-arcsecond structures
are undoubtedly distinguished as well. The two-dimensional variation
of several spectral quantities in the solar atmosphere is shown,
demonstrating the power of this technique and its future possibilities.
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Title: Amplitude and phase stratification of the solar 5-minute
temperature and velocity oscillations through the photosphere
Authors: Rodriguez Hidalgo, I.; Ruiz Cobo, B.; Collados, M.
1996ASPC..109..151R Altcode: 1996csss....9..151R
No abstract at ADS
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Title: Empirical granular/intergranular average model atmospheres.
Authors: Rodríguez Hidalgo, I.; Ruiz Cobo, B.; Del Toro Iniesta,
J. C.; Collados, M.; Sánchez Almeida, J.
1996joso.proc..162R Altcode:
No abstract at ADS
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Title: Empirical model of an average solar granule
Authors: Ruiz Cobo, B.; del Toro Iniesta, J. C.; Rodriguez Hidalgo,
I.; Collados, M.; Sanchez Almeida, J.
1996ASPC..109..155R Altcode: 1996csss....9..155R
No abstract at ADS
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Title: Variations of properties of the quiet photosphere along the
equator and the central meridian: Spectroscopic results
Authors: Rodriguez Hidalgo, I.; Collados, M.; Vazquez, M.
1994A&A...283..263R Altcode:
Spectra of four lines (CI5380.3 A, MnI 5394.7 A, FeI 5930.2 A and
SiI 5948.5 A) have been obtained in the quiet photosphere, at regular
intervals along the polar axis and the equator. The spatially averaged
spectra have been analyzed, studying the center-to-limb variation (CLV)
and possible changes with the heliographic latitude of the residual
intensity (RI), equivalent width (EW), full width at half line minimum
(FWHM), and bisector of the line profiles. The aim of this spectroscopic
study is to complete the photometric work carried out and recently
published by the authors (Rodriguez Hildago et al. 1992, hereafter Paper
I). It allows us to test some conclusions of Paper I and to extend our
analysis to higher photospheric layers. Firstly the general behavior
of the CLV is shown and discussed. From the comparison betwen the CLV
along the North-South and East-West diameters, it is observed that the
Cl line, formed very deep in the photosphere, broadens and shows raised
minima with latitude, not showing variations in its EW, except at very
high latitudes. The other three lines, which inform about the physical
conditions in the middle photosphere, become deeper and stronger, and
the FeI one seems broader, with latitude. The observational results
are discussed in terms of physical scenarios based on changes in the
velocity fields present in the photosphere (mainly of the granulation),
possible spatial anisotropies in the distribution of network bright
points (which would be related to differences in the mean temperature
gradient) and the latitudinal variation of the granulation contrast
found in Paper I.
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Title: Centre-to-limb variation of solar granulation along the
equator and the central meridian
Authors: Rodriguez Hidalgo, I.; Collados, M.; Vazquez, M.
1992A&A...264..661R Altcode:
The paper analyzes white-light images of solar granulation taken
outside active regions, at regular intervals along the polar axis
and the equator, in order to study its center-to-limb variation
and possible changes with the solar latitude. The 2D spatial
power spectra of the brightness distribution are calculated and
corrected for the distortions produced by the atmosphere and the
telescope. One-dimensional integrated spectra are obtained for each
position, with the geometrical foreshortening effect taken into
account. A lower contrast, a smaller mean wavenumber, and a steeper
center-to-limb variation of the contrast are found in the central
meridian as compared to the equator. Sources of error are discussed,
and different scenarios are presented in order to interpret these
observational facts. Intensity fluctuations were detected until the
extreme limb, with a spatial scale of about 10 arcsec.
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Title: Estimating the Degradation of Brightness Power Spectra of
Solar Granulation from Images Outside the Disk Centre
Authors: Rodriguez Hidalgo, I.; Collados, M.; Vazquez, M.
1992A&A...254..371R Altcode:
A method is presented to estimate the influence of the atmospheric
turbulence and the telescope on the mean power spectra of the
granulation brightness distribution at positions outside the disk
centre, derived using the determination of Fried's parameter. <P />The
procedure is based on the differential degradation suffered by the
directions perpendicular and parallel to the solar limb; the former one
is more affected because it contains more power at high frequencies,
due to the geometrical foreshortening effect. A certain spectral ratio
is defined, which can be evaluated after the observed power spectra
and can be described directly by a Korff's function for a given value
of the Fried parameter r<SUB>0</SUB>. The best fit of the measured
attenuation to the theoretical one is calculated, allowing to obtain
the adequate Modulation Transfer Function to reconstruct the original
power spectra. A test has been performed by evaluating the mentioned
ratio after restored spectra showing that these present the required
elongation up to a resolution of about 0".4.
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Title: Variations of properties of the quiet photosphere with
heliographic latitude
Authors: Rodríguez Hidalgo, Inés Lucía
1992PhDT.......245R Altcode:
No abstract at ADS
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Title: Fried's Parameter Derived from Observations of Granulation
Outside the Disk Centre
Authors: Rodriguez Hidalgo, I.; Collados, M.; Vazquez, M.
1990Ap&SS.170..155R Altcode:
A new method has recently been developed to obtain the Fried's parameter
from observations of granulation outsude the disk centre, based on
the different degradation suffered by the images on the directions
parallel and perpendicular to the solar limb, due to the geometrical
foreshortening. This procedure has been applied to CCD images obtained
at the Swedish Solar Tower of the Observatorio del Roque de los
Muchachos, with satisfactory results which are presented and discussed.
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Title: Photometry and Spectroscopy of the Solar Granulation Along
the Polar Axis and Equator
Authors: Rodriguez Hidalgo, I.; Collados, M.; Vazquez, M.
1990Ap&SS.170...23R Altcode:
From high-resolution CCD images of granulation obtained at the Swedish
Solar Tower of the Observatorio del Roque de los Muchachos at different
positions on the solar disk, mean bi-dimensional spatial power spectra
have been obtained at each position and restored following the method
proposed by Rodríguez Hidalgoet al. (1990). The variation with latitude
of the power spectrum, of the granular brightness contrast and of the
mean wave number of the power spectrum are presented. The analysis
is completed with spectroscopic observations obtained at the Gregory
Coudé Telescope of the Observatorio del Teide. The centre-to-limb
and latitudinal variation of the bisectors, residual intensities and
equivalent widths are shown for several photometric lines.
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Title: Numerical determination of the modulation transfer function
from observations of granulation outside the disk centre
Authors: Rodriguez Hidalgo, I.; Collados, M.
1989hsrs.conf..203R Altcode:
No abstract at ADS
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Title: Variation of the granulation with the solar latitude.
Authors: Collados, M.; Rodriguez Hidalgo, I.; Vazquez, M.
1987PAICz..66...41C Altcode: 1987eram....1...41C
Preliminary results of a search for the variation of the
solar granulation properties with the heliographic latitude are
presented. Within errors, no changes are found in the power spectra
and sizes between N-S and E-W scans.
