Non-thermal excitation and ionization of hydrogen in solar flares. I - Effects on a flaring chromosphere

Details Non-thermal excitation and ionization of hydrogen in solar flares. I - Effects on a flaring chromosphere Non-thermal excitation and ionization of hydrogen in solar flares. I - Effects on a flaring chromosphere

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...168..301a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 168, no. 1-2, Nov. 1986, p. 301-307.

Astronomy and Astrophysics

Astrophysics

22

Atomic Excitations, Chromosphere, Electron Bombardment, Gas Ionization, Hydrogen, Radiative Transfer, Solar Flares, Atmospheric Heating, Electron Beams, Radiative Heat Transfer, X Ray Spectra

Scientific paper

By using a semiempirical flare model and assuming that the observed heating is produced by electron bombardment, a computation is made of the energy flux above 20 keV that is required in the beam to compensate for radiative losses. It is then shown that nonthermal processes strongly increase the radiative losses in the middle chromosphere. As a consequence, the temperature increase of existing semiempirical flare models is shown to be overestimated in the low chromosphere. The inclusion of nonthermal processes reduces but does not eliminate the difference between energy gains and losses in the middle chromosphere.Consequently, existing empirical models are not in a static energy balance.

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