Return currents in solar flares - Collisionless effects

Details Return currents in solar flares - Collisionless effects Return currents in solar flares - Collisionless effects

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142..219r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 2, Jan. 1985, p. 219-224.

Astronomy and Astrophysics

Astrophysics

17

Collisionless Plasmas, Magnetohydrodynamic Stability, Plasma-Particle Interactions, Solar Flares, Beam Currents, Electric Fields, Electron Beams, Electron Energy, Plasma Currents, Threshold Currents

Scientific paper

If the primary, precipitating electrons in a solar flare are unstable to beam plasma interactions, it is shown that strong Langmuir turbulence can seriously modify the way in which a return current is carried by the background plasma. In particular, the return (or reverse) current will not be carried by the bulk of the electrons, but by a small number of high velocity electrons. For beam/plasma densities >10-3, this can reduce the effects of collisions on the return current. For higher density beams where the return current could be unstable to current driven instabilities, the effects of strong turbulence anomalous resistivity is shown to prevent the appearance of such instabilities. Again in this regime, how the return current is carried is determined by the beam generated strong turbulence.

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