Physics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2913c&link_type=abstract
Geophysical Research Letters, Volume 24, Issue 22, p. 2913-2916
Physics
15
Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Magnetotail Boundary Layers, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Numerical Modeling
Scientific paper
Ion distributions in the near-Earth magnetotail often deviate significantly from a bi-Maxwellian, the form usually assumed in previous studies of instability in this region of space. Here the electromagnetic dispersion equation for propagation parallel to the background magnetic field is derived from the linearised Vlasov equation for both the generalised bi-Lorentzian (kappa) distribution and a crescent shaped distribution. For the hot drifting proton distributions in the near Earth magnetotail it is found that increasing deviation from bi-Maxwellian toward bi-Lorentzian and crescent shaped forms reduces the maximum temporal growth rates and extends the range of wavenumbers and frequencies where instability occurs. The extension of the range of unstable wavenumbers has the significant effect of increasing convective growth rates in the vicinity of the crossover frequency.
Chaston Christopher. C.
Fraser Brian J.
Hu Yi-Duo
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