Ly-alpha and H-alpha emission by superthermal proton beams

Details Ly-alpha and H-alpha emission by superthermal proton beams Ly-alpha and H-alpha emission by superthermal proton beams

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...295..275c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 295, Aug. 1, 1985, p. 275-284.

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Computation

49

Chromosphere, Doppler Effect, H Alpha Line, Lyman Alpha Radiation, Proton Beams, Solar Flares, Energy Spectra, Nonthermal Radiation

Scientific paper

Simnett and Harrison (1984) have presented a model in which 100-1000 keV protons are an energy transfer agent linking coronal mass ejections and solar flares. Orrall and Zirker (1976) suggested that such protons, incident upon the chromosphere, would produce nonthermal Ly-alpha emission after charge exchange with ambient chromospheric hydrogen atoms. The present investigation is concerned with a study of the charge-exchange mechanism proposed by Orral and Zirker. The physical theory of the formation of nonthermal Ly-alpha (and H-alpha) emission is considered, taking into account photon emission, atomic transitions, atomic equilibrium, the dominant atomic processes, and the stopping of superthermal protons. Computational results presented by Orrall and Zirker are extended.

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