Experiments on the scattering of fast electrons by Alfven waves

Details Experiments on the scattering of fast electrons by Alfven waves Experiments on the scattering of fast electrons by Alfven waves

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53a1366g&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM53A-1366

Physics

[2471] Ionosphere / Plasma Waves And Instabilities, [2487] Ionosphere / Wave Propagation, [2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2720] Magnetospheric Physics / Energetic Particles: Trapped

Scientific paper

High energy ions and electrons with anisotropic distribution functions can be trapped in the earth’s radiation belts for months, which pose a danger for satellites. A electron population with large v⊥ was introduced in the afterglow of the background LAPD plasma (n =2.0eX1011 cm 3, Te= .25 eV ). Microwaves at 2.45 GHz were launched into the plasma at an axial and radial location where fmicro = fUH. A small (2 cm dia) electron hot spot was generated. Shear Alfven waves (f = 192 kHz) launched by an orthogonal loop antenna, with magnitude Bwave ≈ Gauss destroyed the hot spot within 10 cycles. The hot spot returns when the Alfven wave is shut off. Space-time evolution of the plasma density, flow and electron are presented. The mechanism of the electron de-trapping is under investigation. Planned experiments involve the interaction of fast ion rings with shear Alfven waves, and whistler waves with the anisotropic electrons.

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