The ratios I(K1)/I(H1) and I(K3)/I(H3) of ca II as diagnostics of the chromosphere above sunspots

Details The ratios I(K1)/I(H1) and I(K3)/I(H3) of ca II as diagnostics of the chromosphere above sunspots The ratios I(K1)/I(H1) and I(K3)/I(H3) of ca II as diagnostics of the chromosphere above sunspots

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000soph..197...43t&link_type=abstract

Solar Physics, v. 197, Issue 1, p. 43-56 (2000).

Physics

1

Scientific paper

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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