Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..269s&link_type=abstract
Astrophysical Journal, Part 1, vol. 213, Apr. 1, 1977, p. 269-277. Research supported by the Sacramento Peak Observatory;
Astronomy and Astrophysics
Astrophysics
9
Chromosphere, Solar Atmosphere, Solar Spectra, Spectroheliographs, Stellar Models, Absorptivity, Filtergrams, H Alpha Line, Optical Density, Spectrum Analysis
Scientific paper
Contrast profiles obtained from chromospheric filtergrams and spectra of bright and dark mottles have to date been interpreted almost exclusively in terms of Becker's cloud model. Here we demonstrate the failure of this model to account in a physically consistent way for the observed contrasts. As an alternative, we introduce an embedded-feature model, restricting our discussion in this paper to stationary features. Our model is then characterized by three independent parameters: the density of absorbing atoms, the geometrical depth, and the profile of the absorption coefficient. An analytic approximation to the contrast resulting from such a model reproduces well the observed behavior of all types of contrast profiles.
Bar Varda
Gebbie Katharine B.
Steinitz Raphael
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