Langmuir wave generation by thick target electron beams in solar flares - The effects of density variations and reverse currents

Details Langmuir wave generation by thick target electron beams in solar flares - The effects of density variations and reverse currents Langmuir wave generation by thick target electron beams in solar flares - The effects of density variations and reverse currents

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...208..279m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 208, no. 1-2, Jan. 1989, p. 279-286.

Astronomy and Astrophysics

Astrophysics

6

Electron Beams, Electrostatic Waves, Plasma Currents, Plasma Density, Solar Flares, Solar X-Rays, Atmospheric Models, Chromosphere, Flux Density, Plasma Heating, Solar Corona, Target Thickness, Turbulence Effects

Scientific paper

The effect of a finite density gradient on the Langmuir wavelevel produced by a steady state thick target electron beam in the flaring solar corona is numerically investigated. The beam energy losses and associated plasma heating resulting from the presence of a beam-neutralizing reverse current are taken into account. The density and temperature structure of the background plasma are determined self-consistently, assuming steady state energy balance and hydrostatic equilibrium. In those cases where instability occurs, it is found that the wave refraction resulting from a uniform density gradient has an insignificant effect on the Langmuir wavelevel. However, depending on the form of the injected beam distribution, it is possible that the rise in plasma density toward the chromosphere may prevent wave generation from occurring at all. It is shown that a high level of Langmuir turbulence, if it exists, is a manifestation of the acceleration process rather than of any propagation effects, such as the collisional degradation of low velocity electrons. The implications of this result for flare acceleration mechanisms are discussed.

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