Author name code: cuny ADS astronomy entries on 2022-09-14 author:Cuny, Yvette ------------------------------------------------------------------------ Title: Analysis of solar eclipse data - Spicule model in the middle chromosphere Authors: Cuny, Y. Bibcode: 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. Title: An inhomogeneous model of the chromosphere. Authors: Cuny, Y. Bibcode: 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. Title: The Solar Chromospheric Microturbulence and the Emission Observed at Eclipse Authors: Cuny, Y. Bibcode: 1980LNP...114..293C Altcode: 1980sttu.coll..293C; 1980IAUCo..51..293C No abstract at ADS Title: On the abundance determination in the solar chromosphere obtained from eclipse data Authors: Cuny, Y. Bibcode: 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. Title: Excitation atmoique par le rayonnement en présence de champs de vitesse dans la chromosphère solaire Authors: Cuny, Y. Bibcode: 1976pmas.conf..343C Altcode: No abstract at ADS Title: Excitation atomique par le rayonnement en présence de champs de vitesse dans la chromosphère solaire. Authors: Cuny, Y. Bibcode: 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. Title: The Harvard-Smithsonian reference atmosphere Authors: Gingerich, O.; Noyes, R. W.; Kalkofen, W.; Cuny, Y. Bibcode: 1971SoPh...18..347G Altcode: We present a model of the solar atmosphere in the optical depth range from τ5000 = 10−8 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. 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 Bibcode: 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 10−3-4 × 10−5, at 5000 Å; the brightness temperature is compatible with a low electronic temperature minimum near the optical depth 10−4. The model of the low chromosphere is characterized by a steep temperature gradient. The model satisfies observations at millimeter wavelengths. Title: Non-LTE Effects on the Solar Spectrum between 1500 A and 1680 A Authors: Cuny, Y. Bibcode: 1969tons.conf..183C Altcode: No abstract at ADS Title: Influence of the Lyman-α Wing on the Solar Spectrum in the 1500 A to 8000 A Wavelength Range Authors: Cuny, Y. Bibcode: 1969tons.conf..173C Altcode: No abstract at ADS 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. Bibcode: 1968rla..conf..169A Altcode: No abstract at ADS Title: Determination of the Non-LTE Departure Coefficients for a Multi-Level Atom: Remarks on the Iterative Method Authors: Cuny, Y. Bibcode: 1968rla..conf..113C Altcode: No abstract at ADS Title: Contribution à l'étude du spectre solaire de l'hydrogène Authors: Cuny, Y. Bibcode: 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.

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.

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.

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. Title: Détermination exacte de la structure stationnaire d'une atmosphère d'hydrogène. Problème hors de l'équilibre thermodynamique local Authors: Cuny, Y. Bibcode: 1967AnAp...30..143C Altcode: No abstract at ADS Title: Solution of the Transfer Problem Authors: Cuny, Y. Bibcode: 1965SAOSR.174..275C Altcode: No abstract at ADS Title: Influence des inhomogénéités sur l'intensit&eacute centrale des raies de Fraunhofer Authors: Cuny, Y.; Lefèvre, J.; Pecker, J. -C. Bibcode: 1960AnAp...23..923C Altcode: No abstract at ADS