Contribution of the ion-beam acoustic instability to the generation of broadband electrostatic noise - Three-dimensional quasilinear approach

Details Contribution of the ion-beam acoustic instability to the generation of broadband electrostatic noise - Three-dimensional quasilinear approach Contribution of the ion-beam acoustic instability to the generation of broadband electrostatic noise - Three-dimensional quasilinear approach

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38..695b&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 38, May 1990, p. 695-700.

Physics

4

Acoustic Instability, Electrostatic Waves, Geomagnetic Tail, Ion Beams, Plasma Sheaths, Atmospheric Boundary Layer, Noise Spectra

Scientific paper

In order to explain the generation mechanism of the high-frequency part of broadband electrostatic noise (BEN) in the plasma sheet boundary layer of the earth's magnetotail, the nonlinear dynamics of the ion-beam acoustic (IBA) instability is studied within the three-dimensional quasi-linear plasma theory for the background electron distribution function f(e). During the development of the IBA instability first the plateau formation on f(e) in the velocity space is obtained in the direction quasi-parallel to the ion-beam propagation, and quasi-parallel wave modes with frequencies up to the order of the electron plasma frequency and even higher values are excited, which is in accordance with the experimental BEN data. As the resonance region in the three-dimensional case is much larger than that in the one-dimensional approximation, the energy level of the generated waves increases essentially. In the course of time the plateau formation on f(e) propagates into the oblique direction. Thus the wave energy generation is displaced to oblique wave modes, and the maximum generated wave power changes to lower frequencies.

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