On physical conditions in the chromosphere above sunspot umbrae |
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| Authors: | R B Teplitskaja S A Grigoryeva V G Skochilov |
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| Institution: | (1) Siberian Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation, P.B.4, 664033 Irkutsk 33, U.S.S.R. |
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| Abstract: | By means of an inversion of H and K Ca ii line profiles the temperature and electron density in the chromosphere above the umbrae of two sunspots have been estimated. The temperature gradient 5 K km–1 exceeds the corresponding values in both quiet regions and plages. At a height of about 1500 km the umbra becomes hotter than the quiet region. At a temperature of about 10000 K the temperature gradient increases sharply. The electron density at 1500 km is approximately the same as that in the quiet chromosphere at the same height. |
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