Physics – Plasma Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1375n&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A11, pp. SMP 18-1, CiteID 1375, DOI 10.1029/2002JA009250
Physics
Plasma Physics
11
Magnetospheric Physics: Plasma Waves And Instabilities, Interplanetary Physics: Plasma Waves And Turbulence, Space Plasma Physics: Wave/Particle Interactions, Space Plasma Physics: Numerical Simulation Studies
Scientific paper
An electron temperature anisotropy T⊥e > T∥e (where ⊥ and ∥ refer to directions relative to the background magnetic field) can excite the whistler anisotropy instability in a collisionless plasma. The resulting enhanced fluctuating magnetic fields scatter the electrons and reduce the anisotropy. We use particle-in-cell simulations in a spatially homogeneous plasma model to compute the maximum values of the wave-particle scattering rate for electron anisotropy reduction. This rate scales as the electron cyclotron frequency but, for a fixed initial growth rate, is relatively independent of the electron temperature if kBTe <= 5 keV. For larger electron temperatures, the scattering rate decreases with increasing Te, suggesting that relativistic effects play a role.
Gary Peter S.
Li Hui
Nishimura Kazumi
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