Other
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..817e&link_type=abstract
Astrophysical Journal, Part 1, vol. 249, Oct. 15, 1981, p. 817-820.
Other
20
Coulomb Collisions, Electron Beams, Magnetohydrodynamics, Ohmic Dissipation, Solar Atmosphere, Solar Flares, Atmospheric Density, Electron Energy, Flux (Rate), Particle Acceleration, Particle Collisions
Scientific paper
The paper considers the passage of a beam of nonthermal electrons through the flaring solar atmosphere, paying particular attention to the requirement that the beam be stable to the generation of plasma turbulence. The ratio of energy losses due to reverse current ohmic heating and heating by Coulomb collisions, respectively, for the greatest flux which can pass stably through the atmosphere is computed. It is shown that this ratio is determined by the low energy cutoff of the beam, by the electron temperature of the ambient atmosphere, and by the electron to ion temperature ratio theta. It is also independent of the atmospheric density. The results show that ohmic energy losses are undoubtedly important in the initial transient state, in agreement with other authors, but that their role is debatable in the flare atmosphere, depending on the value of theta appropriate.
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