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Author name code: cuny
ADS astronomy entries on 2022-09-14
author:Cuny, Yvette
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Title: Analysis of solar eclipse data - Spicule model in the middle
chromosphere
Authors: Cuny, Y.
1987A&A...175..243C Altcode:
The excitation-ionization equilibria for levels of Sr II and H are
calculated for physical conditions appropriate to spicules represented
by vertical slabs whose thickness is taken as 800 km. The equilibrium
of Sr II, whose transitions are optically thin, is given by the steady
state equations; it depends strongly on the microturbulence and the
vertical flow velocity. The radiation transfer in the optically thick
transitions of a fifteen level atom of hydrogen is calculated. An
application is made to the flash spectrum in the altitude range 1500 -
3200 km. The emission in the resonance line Sr II 4078 Å, the Balmer
line H10 and the continuum emission at 4700 Å are interpreted by an
inhomogeneous model. The vertical flow velocity is a free parameter. The
density, temperature and the filling factor are in agreement with
those associated with spicules in this range of altitude.
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Title: An inhomogeneous model of the chromosphere.
Authors: Cuny, Y.
1985cdm..proc..128C Altcode:
The excitation-ionization equilibrium for levels of Sr II and H is
calculated for physical conditions appropriate to spicules. A vertical
slab whose thickness is taken as 800 km is considered. The transfer of
radiation in the optically thick transitions of a fifteen level atom
of hydrogen is calculated. The excitation-ionization equilibrium of
Sr II which is given by the steady state equations depends strongly
on the microturbulence and the vertical flow velocity. An application
is made to the flash spectrum in the range of altitude 1500-3200 km
above the limb. The emission in the resonance lines of Sr II and the
Balmer line H10, and the Thomson scattering in the Paschen continuum
are interpreted by an inhomogeneous model. The vertical flow velocity
is a free parameter. The electronic density and temperature and the
filling factor are in agreement with those associated with spicules
in this range of altitude.
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Title: The Solar Chromospheric Microturbulence and the Emission
Observed at Eclipse
Authors: Cuny, Y.
1980LNP...114..293C Altcode: 1980sttu.coll..293C; 1980IAUCo..51..293C
No abstract at ADS
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Title: On the abundance determination in the solar chromosphere
obtained from eclipse data
Authors: Cuny, Y.
1979LIACo..22..141C Altcode: 1979eisu.conf..141C; 1979eiu..conf..141C
An analysis of eclipse curves of ionized metals has been done. The
excitation temperature is evaluated, taking account of the effect
of microturbulence; the excitation temperature increases with the
microturbulence, when the line is radially optically thin. The
tangential optical depth of the lines has been considered very
carefully. The relative abundances of Ba II, Sr II, Ti II are in good
agreement with the photospheric values.
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Title: Excitation atmoique par le rayonnement en présence de champs
de vitesse dans la chromosphère solaire
Authors: Cuny, Y.
1976pmas.conf..343C Altcode:
No abstract at ADS
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Title: Excitation atomique par le rayonnement en présence de champs
de vitesse dans la chromosphère solaire.
Authors: Cuny, Y.
1975CRASB.281..117C Altcode:
The effect of microturbulence and macroturbulence in the chromosphere on
the excitation temperature of the multiplets 1-5 of ionized titanium was
calculated in a two-level atomic approximation. The transitions were
assumed to be radially optically thin, while the exciting radiation
was taken to be the radiation observed on the disk. Calculations were
based on the 1960 Gottingen photometric atlas, and the wavelength
from Moore's (1959) table was used for the profile center at zero
macroturbulence. Excitation temperature was calculated for velocity
fields up to 25 km per sec. For macroturbulence and microturbulence
velocities below 15 km per sec, the enhanced excitation temperature
effect was little dependent on multiplet. The effect is strong for
values of microturbulence generally admitted in the chromosphere. These
results are in accord with observational data.
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Title: The Harvard-Smithsonian reference atmosphere
Authors: Gingerich, O.; Noyes, R. W.; Kalkofen, W.; Cuny, Y.
1971SoPh...18..347G Altcode:
We present a model of the solar atmosphere in the optical depth
range from τ<SUB>5000</SUB> = 10<SUP>−8</SUP> to 25. It combines
an improved model of the photosphere that incorporates recent EUV
observations with a new model of the quiet lower chromosphere. The
latter is based on OSO 4 observations of the Lyman continuum, on
infrared observations, and on eclipse electron densities.
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Title: Interpretation of the Solar Continuum from 1680 to 600
Å. Model of the Transition Region Photosphere-Chromosphere and of
the Chromosphere
Authors: Cuny, Yvette
1971SoPh...16..293C Altcode:
An interpretation is given of the observations of the continuous
solar radiation in the spectral range 600-1700 Å. The model allows
for deviations from LTE of H, C, Si and S, and is in hydrostatic
equilibrium. The predicted intensity from 1680 to 1520 Å has virtually
no dependence on the electron temperature variation in the optical
depth range 10<SUP>−3</SUP>-4 × 10<SUP>−5</SUP>, at 5000 Å; the
brightness temperature is compatible with a low electronic temperature
minimum near the optical depth 10<SUP>−4</SUP>. The model of the
low chromosphere is characterized by a steep temperature gradient. The
model satisfies observations at millimeter wavelengths.
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Title: Non-LTE Effects on the Solar Spectrum between 1500 A and 1680 A
Authors: Cuny, Y.
1969tons.conf..183C Altcode:
No abstract at ADS
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Title: Influence of the Lyman-α Wing on the Solar Spectrum in the
1500 A to 8000 A Wavelength Range
Authors: Cuny, Y.
1969tons.conf..173C Altcode:
No abstract at ADS
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Title: Calculations of Solar Hydrogen Lines: Comparative Solutions
for a Standard Line Transfer Problem
Authors: Athay, R. G.; Avrett, E. H.; Beebe, H. A.; Johnson, H. R.;
Poland, A. I.; Cuny, Y.
1968rla..conf..169A Altcode:
No abstract at ADS
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Title: Determination of the Non-LTE Departure Coefficients for a
Multi-Level Atom: Remarks on the Iterative Method
Authors: Cuny, Y.
1968rla..conf..113C Altcode:
No abstract at ADS
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Title: Contribution à l'étude du spectre solaire de l'hydrogène
Authors: Cuny, Y.
1968SoPh....3..204C Altcode:
Les raies et le rayonnement continu de l'hydrogène sont calculés,
dans le cas solaire, en tenant compte des écarts à l'équilibre
thermodynamique local. <P />La comparaison des résultats, interprétés
par la théorie de la formation des raies de Jefferies et Thomas,
avec les observations donne des renseignements sur le modèle de
l'atmosphère solaire. <P />L'énergie émise par Ly α dépend très
fortement de la densité électronique. Seuls les modèles á palier
de température dans la haute chromosphère donnent un profil de Ly
β à dépression centrale. <P />La raie Hα, qui est contrôlée
essentiellement pour les photoionisations dépend surtout du modèle
de photosphère; toutefois les modèles de chromosphère à fortes
température et densité électroniques ont une influence sur le profil
de Hα.
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Title: Détermination exacte de la structure stationnaire
d'une atmosphère d'hydrogène. Problème hors de l'équilibre
thermodynamique local
Authors: Cuny, Y.
1967AnAp...30..143C Altcode:
No abstract at ADS
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Title: Solution of the Transfer Problem
Authors: Cuny, Y.
1965SAOSR.174..275C Altcode:
No abstract at ADS
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Title: Influence des inhomogénéités sur l'intensit&eacute
centrale des raies de Fraunhofer
Authors: Cuny, Y.; Lefèvre, J.; Pecker, J. -C.
1960AnAp...23..923C Altcode:
No abstract at ADS