A burst model for line emission in the solar atmosphere. I - XUV lines of He I and He II in impulsive flares
- 1 February 1992
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 386 (1) , 364-370
- https://doi.org/10.1086/171023
Abstract
A model in which the solar chromosphere is heated by explosive events is developed and used to interpret XUV spectra of He I and He II in impulsive flares observed by the Skylab spectroheliograph. From a comparison of relative line intensities from He I and He II emitted within the flares, the model establishes sizes, durations, and frequencies for the individual events and, by comparison with lines from other elements observed in the same flares, is demonstrated to be consistent with a helium abundance relative to hydrogen of 0.1 for burst temperatures of 15-18 eV.Keywords
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