The unimportance of beam momentum in electron-heated models of solar flares

Details The unimportance of beam momentum in electron-heated models of solar flares The unimportance of beam momentum in electron-heated models of solar flares

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136l...1m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 1, July 1984, p. L1-L4.

Astronomy and Astrophysics

Astrophysics

13

Coronal Loops, Electron Beams, Plasma Acceleration, Solar Electrons, Solar Flares, Collisional Plasmas, Momentum Transfer, Plasma Heating, Plasma-Particle Interactions, Solar Protons, Solar Simulation

Scientific paper

In a previous letter to this journal, Brown and Craig (1984) called attention to the possible importance of the hitherto neglected direct collisional acceleration of flare atmospheres heated by particle beams. For the case commonly believed to be of most physical interest - electron-beam heating in closed flare loops - these arguments are found to be incomplete. Both the early (impulsive) and late (equilibrium) phases of the atmospheric response are treated self-consistently, and in addition the intermediate phase (in which pressure equilibrium, but not energetic equilibrium, has been established) is considered. It is concluded that acceleration due to beam pressure is important for only a few seconds after the electron beam is switched on and is unlikely to have a significant influence on the global flare evolution. Brown and Craig's conclusions should, however, be taken into account in models of proton beam heating, because of the much higher momentum-to-energy ratio of proton beams.

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