Trapping saturation of the bump-on-tail instability and electrostatic harmonic excitation in earth's foreshock

Details Trapping saturation of the bump-on-tail instability and electrostatic harmonic excitation in earth's foreshock Trapping saturation of the bump-on-tail instability and electrostatic harmonic excitation in earth's foreshock

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9514905k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Sept. 1, 1990, p. 14905-14924.

Physics

19

Electron Plasma, Electrostatic Waves, Geomagnetic Tail, Harmonic Excitation, Shock Waves, Trapped Particles, Coupled Modes, Distribution Functions, Electron Flux Density, International Sun Earth Explorers, Velocity Distribution, Vlasov Equations

Scientific paper

The Vlasov simulation is used to examine the trapping saturation of the bump-on-tail instability both with and without mode-mode coupling and subsequent harmonic excitation. It is found that adding the pumped harmonic modes leads to a significant difference in the behavior of the phase-space distribution function near the unstable bump at the saturation time of the instability. The pumped modes permit rapid plateau formation on the space-averaged velocity distribution, in effect preventing the onset of the quasi-linear velocity-diffusion saturation mechanism.

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