Abstract
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.
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Original Russian Text © S.A. Grigoryeva, R.B. Teplitskaya, O.A. Ozhogina, 2009, published in Astronomicheskiĭ Zhurnal, 2009, Vol. 86, No. 6, pp. 616–624.
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Grigoryeva, S.A., Teplitskaya, R.B. & Ozhogina, O.A. Limb darkening of the Call K line wings. Comparison with the average quiet Sun models. Astron. Rep. 53, 569–577 (2009). https://doi.org/10.1134/S1063772909060109
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DOI: https://doi.org/10.1134/S1063772909060109