Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266..573g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 573-580.
Astronomy and Astrophysics
Astrophysics
17
Coronal Loops, Dynamic Models, Hydrodynamic Equations, Solar Flares, Solar Spectra, Calcium, Chromosphere, H Alpha Line, Line Spectra
Scientific paper
Based on a thermal hydrodynamic model of solar flares, we have for the first time simultaneously computed the theoretical Ca XIX spectra (3.163-3.22 A) as well as H-alpha and Ca II K line profiles. The results show that the soft X-ray lines are to a large degree qualitatively consistent with the observations. The only deficiency is the predominant blueshifted component in the early impulsive phase. The explanations for this difference are discussed. In the chromosphere, although mostly unaffected by heating, the H-alpha and Ca II K lines are rather strong. The asymmetric characteristics calculated show to be also compatible with the observations. We therefore conclude that the thermal hydrodynamic model can describe the observed spectral characteristics of solar flares rather well.
Fang Chen
Gan Wei-Qun
Rieger Erich
Zhang Qing-Hong
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