Abstract
Part of the proper X-ray emission of a flare is absorbed in the chromosphere and heats the region which creates an optical (in particular Hα) flare emission. The heating of chromosphere by X-ray emission may be responsible for the diffuse halo around the flare kernels. The optical emission of flare kernels, whose main sources of heating are energetic particles and/or thermal fluxes, may be also increased.
By simple model calculations the present paper discusses the possibility of such effects for the large flare of 1972 August 7.
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Somov, B.V. X-ray heating of a low-temperature region in chromospheric flares. Sol Phys 42, 235–246 (1975). https://doi.org/10.1007/BF00153299
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DOI: https://doi.org/10.1007/BF00153299