H-alpha profiles from electron-heated solar flares

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Atmospheric Models, H Alpha Line, Solar Atmosphere, Solar Electrons, Solar Flares, Chromosphere, Energetic Particles, Temperature Distribution

Scientific paper

The status of models of optical flare heating by electron bombardment is briefly reviewed. Brown's (1973) flare model atmospheres are recomputed using considerably revised radiative loss rates based on Canfield's (1974) method applied to H-alpha, L-alpha, and H(-). Profiles of H-alpha are computed and compared with observation. The computed profiles agree satisfactorily with those observed during the large flare of August 7, 1972, if spatial and velocity inhomogeneities are assumed. The electron injection rate inferred from H-alpha is one order of magnitude less than that inferred from hard X-rays, for this event. This may be due to either (1) the neglect of a mechanism that reduces the thick-target electron injection rate or (2) failure to incorporate important radiative-loss terms.

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