Abstract
The ratios I(K 1)/I(H 1) and I(K 3)/I(H 3) were calculated from four semi-empirical models of sunspot umbra. We determined the dependencies of both ratios of such parameters as temperature gradient and atmospheric opacity. A certain influence on the expected ratios I(K 1)/I(H 1) and I(K 3)/I(H 3) can also come from the FIP effect provided it exists in the chromosphere above sunspot umbra. Theoretical and observed values of I(K 1)/I(H 1) and I(K 3)/I(H 3) are compared. It is shown that for one of the sunspots we observed, the values obtained for the ratio I(K 1)/I(H 1) cannot be explained in terms of existing umbra models.
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Turova, I., Grigoryeva, S. The ratios I(K1)/I(H1) and I(K3)/I(H3) of ca II as diagnostics of the chromosphere above sunspots. Solar Physics 197, 43–56 (2000). https://doi.org/10.1023/A:1026586501038
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DOI: https://doi.org/10.1023/A:1026586501038