On the dynamics of the chromosphere above sunspots |
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| Authors: | Yu D Zhugzhda V I Makarov |
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| Institution: | (1) Institute Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN), 142092 Troitsk, U.S.S.R.;(2) Kislovodsk Station of the Pulkovo Observatory, 357741 Kislovodsk, U.S.S.R. |
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| Abstract: | The brightness oscillations of a sunspot umbra in the H and Ca+ K lines are studied. The observational results are explained in terms of the resonance theory of slow-mode magnetohydrodynamic waves in the sunspot chromosphere. The thickness of the chromosphere above a sunspot varies quasi-periodically from 420 km to 1000 km. |
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