On the persistence of unstable bump-on-tail electron velocity distributions in the earth's foreshock

Details On the persistence of unstable bump-on-tail electron velocity distributions in the earth's foreshock On the persistence of unstable bump-on-tail electron velocity distributions in the earth's foreshock

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.9628k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Sept. 1, 1988, p. 9628-9648.

Physics

18

Electron Distribution, Magnetohydrodynamic Stability, Space Plasmas, Velocity Distribution, Boundary Value Problems, Bow Waves, Plasma Waves, Satellite Observation, Shock Waves

Scientific paper

This paper presents further evidence for the persistence of bump-on-tail unstable reduced velocity distributions in the earth's electron foreshock, which contradicts the understanding of quasi-linear saturation of the bump-on-tail instability. A modified theory for the saturation of the bump-on-tail instability in the earth's foreshock is proposed to explain the mechanism of this persistence, and the predictions are compared to the results of a numerical simulation of the electron plasma in the foreshock. The results support the thesis that quasi-linear saturation of the bump-on-tail instability is modified in the foreshock, due to the driven nature of the region, so that at saturation the stabilized velocity distribution still appears bump-on-tail unstable to linear plasma analysis.

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