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On physical conditions in the chromosphere above sunspot umbrae

✍ Scribed by R. B. Teplitskaja; S. A. Grigoryeva (Efendieva); V. G. Skochilov

Publisher
Springer
Year
1978
Tongue
English
Weight
467 KB
Volume
56
Category
Article
ISSN
0038-0938

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✦ Synopsis

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 10 000 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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