Physics – Plasma Physics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10510751g&link_type=abstract
Journal of Geophysical Research, Volume 105, Issue A5, p. 10751-10760
Physics
Plasma Physics
16
Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Numerical Simulation Studies, Space Plasma Physics: Wave/Particle Interactions, Space Plasma Physics: Waves And Instabilities
Scientific paper
An electron temperature anisotropy T⊥e/T∥e>1 leads to excitation of three distinct modes, the whistler, the electrostatic, and the Z-mode instabilities, in collision-less plasmas at frequencies below the electron cyclotron frequency |Ωe|. (Here perpendicular and parallel subscripts denote directions relative to the background magnetic field.) Two-and-one-half-dimensional particle-in-cell simulations are used to study the nonlinear consequences of the growth of these modes in homogeneous plasmas with ωe~|Ωe|, where ωe is the electron plasma frequency. The simulations show that wave-particle scattering by enhanced fluctuations from the whistler and electrostatic anisotropy instabilities imposes a β-dependent upper bound on the electron temperature anisotropy at β∥e<=0.10. The simulations also demonstrate that the maximum value of the dimensionless fluctuating magnetic fields increases with β∥e and that at sufficiently low β the electrostatic instability leads to non-Maxwellian suprathermal enhancements on the reduced electron velocity distribution fe(ν∥).
Gary Peter S.
Hesse Michael
Winske Dan
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