Proton and helium cyclotron anisotropy instability thresholds in the magnetosheath

Details Proton and helium cyclotron anisotropy instability thresholds in the magnetosheath Proton and helium cyclotron anisotropy instability thresholds in the magnetosheath

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.5915g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A4, p. 5915-5921

Physics

Geophysics

31

Anisotropy, Cyclotron Resonance, Helium Ions, Magnetohydrodynamic Stability, Magnetosheath, Proton Energy, Computerized Simulation, Distribution Functions, Geophysics, Magnetospheric Ion Density, Proton Scattering, Space Plasmas

Scientific paper

Both the protons and the helium ions of the terrestrial magnetosheath typically display T (sub perpendicular) greater than T (sub parallel), where perpendicular to and parallel to denote directions perpendicular and parallel to the background magnetic field. Observations of the highly compressed magnetosheath show an inverse correlation between these ion temperature anisotropies and the parallel proton beta. Computer simulations have demonstrated that these correlations are due to wave-particle scattering by electromagnetic ion cyclotron anisotropy instabilities. These correlations correspond to linear theory thresholds of the proton cyclotron and the helium cyclotron instabilities. This paper uses linear Vlasov theory and the assumption of a constant maximum growth rate to obtain closed-form expressions for these thresholds as a function of the relative helium density and the parallel proton beta in a parameter model of the magnetosheath.

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