On physical conditions in the chromosphere above sunspot umbrae

Details On physical conditions in the chromosphere above sunspot umbrae On physical conditions in the chromosphere above sunspot umbrae

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...56..293t&link_type=abstract

Solar Physics, vol. 56, Feb. 1978, p. 293-303.

Physics

9

Chromosphere, Electron Density (Concentration), Solar Temperature, Sunspots, Umbras, Calcium, Faculae, H Lines, K Lines, Temperature Distribution, Temperature Gradients

Scientific paper

By means of an inversion of H and K Ca II line profiles the temperature and electron density in the chromosphere above the umbras of two sunspots have been estimated. The temperature gradient 5 K/km 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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