Physics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...80..129b&link_type=abstract
Solar Physics, vol. 80, Sept. 1982, p. 129-141. Research supported by the Science Research Council.
Physics
23
Coulomb Collisions, Electron Beams, Ohmic Dissipation, Plasma Heating, Solar Flares, Atmospheric Models, Atmospheric Temperature, Plasma Temperature, Solar Corona, Time Dependence
Scientific paper
The dynamics of an electron beam, under the effects of Coulomb collisions and classical Ohmic dissipation of the return current, is analyzed for a background plasma with a temperature which is time dependent due to the heating effect of beam dissipation offset by thermal conductive cooling. It is shown that the plasma is heated toward a steady state, in time scales short compared to typical flare beam switch on times, and that in this steady state only two regimes of beam dynamics arise. For moderate values of the ratio of beam flux to plasma density, beam dynamics is dominated by direct Coulomb collisions as in the usual thick target treatment. With increase of this ratio, before return current (classical) Ohmic losses can exceed collisions, the return current becomes unstable. In this latter regime beam dynamics is presumably dominated by wave generation and anomalous Ohmic dissipation of the return current, but no detailed treatment is attempted here.
Brown John C.
Hayward Justin
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