Instability of beam-driven return currents in the deep chromosphere of solar flares.

Details Instability of beam-driven return currents in the deep chromosphere of solar flares. Instability of beam-driven return currents in the deep chromosphere of solar flares.

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...305l..49m&link_type=abstract

Astronomy and Astrophysics, v.305, p.L49

Astronomy and Astrophysics

Astrophysics

5

Sun: Flares, Electron Beams, Return Currents

Scientific paper

It i shown that, contrary to previous thinking, the return current driven by a thick target flare beam may be unstable to ion sound wave generation in the deep chromosphere, particularly for intense hard beams and early in the flare. This is so despite the strong collisional attenuation of the beam and the high plasma density in the chromosphere because the low ionisation there results in a high drift velocity of the few free electrons available to carry the return current. The resulting ion acoustic wave generation will enhance local beam heating and affect diagnostics through the presence of enhanced microscopic and return current electric fields.

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