Simulation of the electron acoustic instability in the polar cusp

Details Simulation of the electron acoustic instability in the polar cusp Simulation of the electron acoustic instability in the polar cusp

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.8269l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Sept. 1, 1985, p. 8269-8280. Research sponsored by the Southwest Rese

Physics

25

Acoustic Instability, Computerized Simulation, Electron Plasma, Magnetohydrodynamic Stability, Polar Cusps, Electron Beams, Electron Density (Concentration), Hiss, Plasma Temperature, Temporal Distribution, Trapped Particles

Scientific paper

A computer simulation of the beam-driven electron acoustic instability in the polar cusp is used to investigate the temporal evolution of typical cusp electron distribution functions in self-consistently generated wave fields. The simulation results are compared with linear, second-order, and nonlinear theory. The behavior of the instability over a range of plasma parameters, such as beam speed and the cold electron density, is shown. The saturation mechanism of the instability is examined, and the relevance of the results for observations of cusp hiss are discussed.

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