1975•Unpublished venueRequires access
Why few lines of the Balmer series are observed in flares on the disk
L. N. Kurochka, G. F. Sitnik
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Abstract
It is shown that the populations of the upper levels of hydrogen atoms in flares starting with the 10th level are distributed according to the statistical weights of the levels, and that the optical thicknesses in the far Balmer lines are considerably less than unity. Thanks to these two conditions the intensities of the higher lines of the Balmer series must decrease rapidly with number, which results in the small number of observed lines in flares on the disk. The population of the second level of hydrogen atoms and the emission measures in flares are also estimated.