Beam-driven return current instability and anomalous plasma heating in solar flares

Details Beam-driven return current instability and anomalous plasma heating in solar flares Beam-driven return current instability and anomalous plasma heating in solar flares

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988soph..115..289c&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 115, no. 2, 1988, p. 289-312. SERC-supported research.

Physics

12

Beam Currents, Magnetohydrodynamic Stability, Plasma Heating, Solar Flares, Solar Wind, Electron Beams, Electron Energy, Ion Acoustic Waves, Ohmic Dissipation, Resistance Heating, Wave Generation

Scientific paper

The authors consider the problem of ion-acoustic wave generation, and resultant anomalous Joule heating, by a return current driven unstable by a small-area thick-target electron beam in solar flares. They demonstrate the existence of two quite distinct types of ion-acoustic unstable heating regimes: marginally stable heating and a "catastrophic" heating regime. For the marginally stable case electron and ion heating equations are solved numerically. Rapid anomalous Ohmic heating occurs then in a substantial plasma volume. This large hot plasma emits thermal bremsstrahlung hard X-rays (⪆20 keV) comparable to, or exceeding, the nonthermal bremsstrahlung. This means that with small beam areas, this indirect mechanism can result in a higher hard X-ray bremsstrahlung efficiency than in a conventional collisional thick target. The catastrophic heating regime is discussed qualitatively.

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