A qualitative interpretation of 7 August 1972 impulsive phase flare H alpha line profiles

Physics

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Atmospheric Heating, Chromosphere, Electron Energy, H Alpha Line, Solar Flares, Solar Temperature, Astronomical Models, Coulomb Collisions, Electron Beams, Impulses, Optical Thickness, Power Spectra, Radiative Transfer

Scientific paper

The considered investigation shows that existing models of the formation of the H-alpha line during flares appear to provide clear qualitative evidence that heating of the H-alpha forming regions of the flare chromosphere in the bright H-alpha kernels observed during the impulsive phase of solar flares is not due primarily to heating by Coulomb collisions of a power-law distribution of 10-100 keV electrons with chromospheric material. It appears rather that some shorter-range process, involving possibly conduction or optically thick radiative transfer, is favored. Such a conclusion is clearly relevant to collisionless confinement modelling. However, much work remains to be done before there will be a basis for quantitatively testing the consistency of the considered picture with chromospheric diagnostics.

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