Generation of plasma waves by thick-target electron beams, and the expected radiation signature

Details Generation of plasma waves by thick-target electron beams, and the expected radiation signature Generation of plasma waves by thick-target electron beams, and the expected radiation signature

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321..721h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 15, 1987, p. 721-734.

Astronomy and Astrophysics

Astrophysics

12

Electromagnetic Radiation, Electron Beams, Electron Mobility, High Energy Electrons, Plasma Waves, Thermal Plasmas, Coulomb Collisions, Cross Sections, Energetic Particles, Energy Dissipation, Kinetic Equations, Solar Flares

Scientific paper

The production of plasma waves by a nonthermal beam of high-energy electrons injected into a background thermal plasma was investigated. The coupled kinetic equations for nonthermal electrons were solved, and the level of the plasma waves produced by the bump-on-tail instability arising as a result of the Coulomb collisions of nonthermal electrons with background plasma was estimated. In addition, the radiation signatures of these waves were examined. It is shown that the wave-particle interactions have a significant effect on the overall distribution of the electrons and that it is unlikely that such effects can be discerned in the observed bremsstrahlung or synchrotron radiation of the nonthermal electrons. However, a significant fraction of the energy lost by the beam is transferred to plasma waves and is then dissipated by the thermal plasma.

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