Ion anisotropy instabilities in the magnetosheath

Details Ion anisotropy instabilities in the magnetosheath Ion anisotropy instabilities in the magnetosheath

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1481g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A2, p. 1481-1488.

Physics

85

Ion Distribution, Magnetohydrodynamic Stability, Magnetosheath, Magnetospheric Ion Density, Space Plasmas, Cyclotron Resonance, Mathematical Models

Scientific paper

Recent observations in Earth's magnetosheath have delineated several different kinds of magnetic fluctuation spectra below the proton cyclotron frequency. This paper provides a theoretical interpretation for some of these observations describing solutions of the linear Vlasov dispersion equation for fully electromagnetic instabilities for particle distributions which model those observed in the magnetosheath. This model yields three growing modes: the proton cyclotron anisotropy the helium cyclotron anisotropy, and the mirror instabilities. The results show very good agreement with the observations of mirror-like and proton-cyclotron-like events. This agreement with observations implies that the transition between cyclotron and mirror fluctuation dominance is consistent with linear theory.

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