Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..923h&link_type=abstract
Astronomy and Astrophysics, Vol. 274, p. 923 (1993)
Astronomy and Astrophysics
Astrophysics
39
Line: Profiles, Radiative Transfer, Sun: Flares
Scientific paper
The effects on the Hα line profile of non-thermal excitation and ionization of hydrogen by a 100 KeV- 1 MeV proton beam have been investigated. Non-LTE Hα line profiles have been calculated for the temperature distributions of semi- empirical flares models F1 and F2 (Machado et al. 1980). For reasonable values of the beam energy flux and power index, the hydrogen lines are greatly strengthened. However, contrary to the case of an electron bombarded atmosphere, the line is not broadened, and no central reversal appears. These effects, alone or in conjunction with linear polarization measurements or Lyα red wing observations, can be used to diagnose proton beam bombardment.
Fang Chen
Gan Wei-Qun
Hénoux Jean-Claude
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