Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..917f&link_type=abstract
Astronomy and Astrophysics, Vol. 274, p. 917 (1993)
Astronomy and Astrophysics
Astrophysics
66
Line: Profiles, Radiative Transfer, Sun: Flares
Scientific paper
The significance of non-thermal excitation and ionization of hydrogen and CaII, by an electron beam, on the line profiles of Hα and CaII K line has been investigated. Non-LTE Hot and CaII K line profiles have been calculated for the temperature distributions of semi-empirical flares models F1 and F2 (Machado et al. t980). For reasonable values of the beam energy flux and power index, the hydrogen lines are greatly strengthened and broadened, and an obvious central reversal appears. The effects are weaker for the CaII K line. These effects can be used to diagnose electron beam bombardment during a solar flare, especially at its early phase. Any semi-empirical flare model that does not take into account non-thermal effects overestimates the heating of the solar atmosphere.
Fang Chen
Gan Wei-Qun
Hénoux Jean-Claude
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