Ring current instabilities in the magnetohydrodynamic frequency range

Details Ring current instabilities in the magnetohydrodynamic frequency range Ring current instabilities in the magnetohydrodynamic frequency range

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..644h&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 9, p. 644-646.

Physics

Plasma Physics

6

Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Plasma Frequencies, Ring Currents, Space Plasmas, Magnetohydrodynamic Turbulence, Plasma Physics

Scientific paper

This report summarizes recent theoretical developments in ring current plasma instabilities in the magnetohydrodynamic (MHD) frequency range but with the effect of finite Larmor radius, and discusses its relevance to satellite-based observations. Possible instabilities are the bounce resonant instabilities caused by a humped energy distribution, the drift mirror instability caused by an anisotropic pressure and the drift wave type instability caused by a combination of drift-bounce resonance and reduced Alfven frequency due to a high beta loading of the flux tube. Here, beta is proportional to plasma/magnetic pressures. Mechanisms leading to turbulence are also discussed.

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