Whistler anisotropy instability in the magnetosphere: Linear theory

Details Whistler anisotropy instability in the magnetosphere: Linear theory Whistler anisotropy instability in the magnetosphere: Linear theory

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13b2053g&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM13B-2053

Physics

Plasma Physics

[2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2774] Magnetospheric Physics / Radiation Belts, [7829] Space Plasma Physics / Kinetic Waves And Instabilities

Scientific paper

Linear kinetic dispersion theory has been studied for the whistler anisotropy instability driven by the electron temperature anisotropy T{⊥ e}/T{∥ e} > 1. If the ratio of the electron plasma frequency to the electron cyclotron frequency is greater than unity and β {∥ e} ≥ 0.025, the maximum growth rate of the instability is at propagation parallel to the background magnetic field Bo and the fluctuating fields are substantially electromagnetic. At smaller values of β {∥ e}, the maximum growth rate shifts to propagation oblique to Bo, and the fluctuating electric fields become primarily electrostatic. If the electron velocity distribution can be described as the sum of two anisotropic components with different parallel temperatures, linear theory predicts that each component drives the growth of a distinct, independent whistler instability. For typical magnetospheric parameters, this configuration gives rise to two distinct frequency bands of growing modes, similar to the banded chorus often observed in the magnetosphere.

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