Quasi-monochromatic wave-particle interactions in magnetospheric plasmas

Details Quasi-monochromatic wave-particle interactions in magnetospheric plasmas Quasi-monochromatic wave-particle interactions in magnetospheric plasmas

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..111...59l&link_type=abstract

(Observatoire de Paris, CNRS, CNES, et al., CESRA Workshop on Particle Acceleration and Trapping in Solar Flares, 2nd, Aubigny-s

Physics

10

Magnetospheric Instability, Plasma Waves, Plasma-Particle Interactions, Collisional Plasmas, Electron Acceleration, Magnetospheric Electron Density

Scientific paper

The effects of plasma inhomogeneities on resonant quasi-coherent wave particle iteractions (WPIs) are investigated. It is found that the inhomogeneity of the medium alters the wavenumber, and thus alters the relative phase between the wave and the particle's motion. Although the WPI efficiency is decreased, as resonant conditions cannot be fulfilled over a large wave path, the resulting interaction of a monochromatic wave with a larger set of charged particles tends to restore a quasi-linear-like diffusion process. The inhomogeneity is shown to change the saturation level of the kinetic instabilities even when trapping occurs. The results indicate that trapping may be an efficient acceleration process.

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