Physics – Plasma Physics
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2457g&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 16, p. 2457-2460
Physics
Plasma Physics
15
Magnetospheric Physics: Magnetosheath, Magnetospheric Physics: Magnetotail, Space Plasma Physics: Waves And Instabilities
Scientific paper
The electromagnetic proton cyclotron instability is driven by a proton temperature anisotropy T⊥p/T∥p>1 where the directional subscripts denote directions relative to the background magnetic field. Enhanced field fluctuations from instability growth lead to wave-particle scattering which reduces the anisotropy; previous research has demonstrated that the anisotropy is constrained by a power-law function of β∥p. Here two-dimensional hybrid simulations in a homogeneous, magnetized, collisionless plasma are used to derive a scaling relation for the maximum scattering rate of proton anisotropy reduction. The result is a function only of the anisotropy and β∥p and so is appropriate for use in fluid models of anisotropic plasmas such as the magnetosheath.
Gary Peter S.
Winske Dan
Yin Lin
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