Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009arep...53..569g&link_type=abstract
Astronomy Reports, Volume 53, Issue 6, pp.569-577
Astronomy and Astrophysics
Astronomy
2
96.60.Mz, 96.60.Na
Scientific paper
The detailed measurements of Call K line profiles along a diameter of the solar disk are presented. The obtained limb-darkening curves are used to test three semi-empirical models for the quiet Sun assuming moderate resolution. The calculations were carried out using the non-LTE code MULTI, taking into account a partial frequency redistribution. A comparative analysis of the measured and computed curves shows that the behavior of the Call K profiles from the center to the limb is sensitive to the temperature distributions of the semi-empirical models. The SRPM 305 model published by Fontenla et al. (2007) best reproduces the observed limb darkening in the region from the photosphere to the lower chromosphere; however, the agreement of this model with the observations at the line center is worse than for the other models, since this model was not assigned to describe hot chromospheric layers.
Grigoryeva S. A.
Ozhogina O. A.
Teplitskaya R. B.
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