The Harvard-Smithsonian reference atmosphere |
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Authors: | O Gingerich R W Noyes W Kalkofen Y Cuny |
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Institution: | (1) Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass., U.S.A.;(2) Observatoire de Paris, Section d'Astrophysique, Meudon, France |
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Abstract: | We present a model of the solar atmosphere in the optical depth range from 5000 = 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.Our model differs from the Bilderberg Continuum Atmosphere (BCA) in the low chromosphere ( 5000 < 10–4), where deviations from local thermodynamic equilibrium in hydrogen and carbon have been taken into account. It also differs in the transition region between the chromosphere and the photosphere (10–4 < 5000 < 10–2), where the temperature is lower than in the BCA, and in the convective region ( 5000 2), where the temperature is higher than in the BCA. |
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