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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&amp;eacute
    centrale des raies de Fraunhofer
Authors: Cuny, Y.; Lefèvre, J.; Pecker, J. -C.
1960AnAp...23..923C    Altcode:
  No abstract at ADS