Whistler instability: Electron anisotropy upper bound

Details Whistler instability: Electron anisotropy upper bound Whistler instability: Electron anisotropy upper bound

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10110749g&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A5, p. 10749-10754

Physics

Plasma Physics

42

Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Kinetic And Mhd Theory, Space Plasma Physics: Wave/Particle Interactions, Space Plasma Physics: Waves And Instabilities

Scientific paper

If the electron distribution function is approximately bi-Maxwellian with T⊥/T∥>1, where the subscript symbols denote directions perpendicular and parallel to the background magnetic field, and if this temperature anisotropy is sufficiently large, the whistler anisotropy instability is excited. This mode is studied using two-dimensional particle-in-cell simulations in a spatially homogeneous plasma model. Theory predicts a threshold electron anisotropy for this instability which depends inversely on the electron parallel β. The simulations show that wave-particle scattering by enhanced whistler fluctuations maintain the initially bi-Maxwellian character of the electron distribution, and that this scattering imposes an upper bound on the electron T⊥/T∥ commensurate with that predicted by linear theory.

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