Physics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..143..141g&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 143, no. 1, p. 141-149.
Physics
8
Chromosphere, H Alpha Line, Solar Flares, Solar Spectra, Red Shift, Solar Orbits
Scientific paper
An empirical study of the influence of the chromospheric condensation on H-alpha line profiles for the thermal model of a solar flare is presented. When the temperature within the condensation region is assumed to be equal to that in front of it, the effect is to create an additional absorption profile overlapping on the original one. By increasing the condensation strength, the H-alpha line profile changes from a little line-center increase to broadened red asymmetry, then to the reversed red asymmetry, and finally to two independent absorption profiles. The thickness of the condensation determines the absorption of the additional profile. Assuming the temperature within the condensation is higher than that ahead of the condensation, the calculated H-alpha line profiles may be strong enough to be comparable with the observations. It is concluded that if the condensation in the purely thermal model can reach a higher temperature, only thermal origin may be used to explain a chromospheric flare.
Fang Chen
Gan Wei-Qun
Rieger Erich
Zhang Qing-Hong
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