Heating of the Deep Chromosphere during Solar Flares.
Final rept. 1 Dec 83-30 Sep 84,
ALABAMA UNIV IN HUNTSVILLE
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The role of the negative hydrogen ion, in the energy balance of the deep chromosphere is reassessed and quantitatively evaluated. We find that in quiet Sun conditions the negative hydrogen ion H is a heating agent, absorbing more photospheric radiation than it reradiates. We further propose that during flares a flux of UV radiation produces over ionization of the deep chromosphere principally by ionizing neutral silicon and that the increased electron density so produced causes an increase in the H e yields H association rate and so an increased H abundance. The resulting increased absorption of photospheric radiation by the H ions produces heating compatible with observations. Author