Abstract
A comparison of theoretical and observed Caii H and K line profiles in sunspot umbrae has been made for different sunspot positions on the solar disk. Four semi-empirical static umbral models were used in calculations: the SUNSPOT model of Avrett (1981), and the models of Staude (1982), Maltby et al. (1986), and Severino, Gomez, and Caccin (1994). The models suggested by Avrett, Maltby et al., and Severino, Gomez, and Caccin reproduce the center-to-limb evolution of the shape of observed profiles. The best agreement with profile parameters obtained from observations is given by the Severino, Gomez, and Caccin model.
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Grigoryeva, S.A., Turova, I.P. Center-to-Limb Variations of the Ca II H and K Lines in Sunspot Umbrae. Solar Physics 179, 17–30 (1998). https://doi.org/10.1023/A:1005058906009
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DOI: https://doi.org/10.1023/A:1005058906009