Electrons in the solar corona |
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Authors: | Dollfus Audouin Laffineur Marius Mouradian Zadig |
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Institution: | 1. Dept. of Applied Mathematics, University of Sydney, Sydney, Australia 2. National Measurement Laboratory, CSIRO, Sydney, Australia
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Abstract: | We discuss a model for the formation of the chromospheric Ca ii K line which does not make the usual assumption of complete redistribution. Using a physically reasonable scattering model, we find significant departures due to the frequency dependence of the line source function, particularly in the relative intensity and centre-to-limb behaviour of the K1 parts of the line and in the asymmetry produced by differential velocity fields. We conclude that the frequency dependence of the K line source function must be considered in quantitative models for the formation of the K line. |
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