The proton cyclotron instability and the anisotropy/B inverse correlation

Details The proton cyclotron instability and the anisotropy/B inverse correlation The proton cyclotron instability and the anisotropy/B inverse correlation

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.5903g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A4, p. 5903-5914

Physics

Geophysics

71

Anisotropy, Cyclotron Resonance, Ion Temperature, Magnetic Fields, Magnetohydrodynamic Stability, Magnetosheath, Proton Energy, Boltzmann-Vlasov Equation, Data Correlation, Geophysics, Ion Cyclotron Radiation, Plasma Interactions, Space Plasmas

Scientific paper

Spacecraft observations in the strongly compressed subsolar magnetosheath show an inverse correlation between the proton temperature anistrophy (T(sub perpendicular to p)/T(sub parallel to p) greater than 1 where perpendicular to and parallel to denote directions perpendicular and parallel to the background magnetic field) and the parallel proton beta (beta(sub parallel to p). This manuscript uses one-dimensional hybrid simulations of the proton cyclotron anisotropy instability in homogeneous electron-proton plasmas to study this correlation which may represent a limited closure relation for fluid theories of anisotropic space plasmas. The emphasis is on driven simulation which increase the temperature anisotropy by periodically reducing the magnetic-field-aligned velocities of the protons. The late-time states from ensembles of both initial value and driven simulations yield very similar expressions for the proton anisotropy/beta(sub parallel to P) inverse correlation, and provide a basis for explaining differences between sheath observations from different spacecraft. The driven simulations also yield expressions for the maximum instability growth rate and the fluctuating field energy as functions of beta (sub parallel to p) and a parameter characterizing the anisotropy driver.

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