Fast formation of a Plateau on the electron distribution function during the early phase of the ion-ion instability

Details Fast formation of a Plateau on the electron distribution function during the early phase of the ion-ion instability Fast formation of a Plateau on the electron distribution function during the early phase of the ion-ion instability

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...101.7903m&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A4, p. 7903-7912

Physics

1

Magnetospheric Physics: Auroral Phenomena, Electromagnetics: Plasmas, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Numerical Modeling

Scientific paper

Numerical simulations of the ion-ion instability carried out with parameters suitable to the description of the plasma in the high-altitude auroral region of the Earth show a very fast evolution of the electron distribution function that cannot be explained by the quasi-linear theory. A detailed analysis of this phenomenon has been carried on. A model based on the reflection of electrons against potential structures created during the linear phase of the ion-ion instability is discussed. The lifetime of the potential structures, which is longer than one ion gyroperiod, can be explained by the linear theory of the ion-ion instability. A simple statistical model of these potential structures enables us to reproduce accurately the evolution of the electron distribution function.

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