Lower hybrid drift instability at the inner edge of the ring current

Details Lower hybrid drift instability at the inner edge of the ring current Lower hybrid drift instability at the inner edge of the ring current

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.2325r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, March 1, 1990, p. 2325-2332.

Physics

11

Electrostatic Waves, Magnetohydrodynamic Stability, Plasma Interactions, Plasmasphere, Ring Currents, Cyclotron Frequency, Plasma Density, Plasma Drift

Scientific paper

Excitation of electrostatic waves around and above the lower hybrid frequency at the inner edge of the ring current is investigated. The model consists of cold plasmaspheric ions; hot, dilute, inhomogeneous ring current ions; and cold charge neutralizing electrons. It is shown that in the presence of a sufficiently large density gradient the coupling of the lower hybrid with the drift cyclotron harmonic mode destabilizes the plasma. Unstable interactions also occur at higher cyclotron harmonics when the lower hybrid is replaced by an ion Bernstein mode. Additional power at frequencies above the lower hybrid frequency is attributed to the thermal enhancement by the hot ring current ions, which increases with their density gradient. Particle simulations are conducted, and comparison to AMPTE data is discussed.

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