Proton-cyclotron instabilities in non-uniform loss-cone magnetospheric plasma

Details Proton-cyclotron instabilities in non-uniform loss-cone magnetospheric plasma Proton-cyclotron instabilities in non-uniform loss-cone magnetospheric plasma

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ap%26ss..70..467b&link_type=abstract

Astrophysics and Space Science, vol. 70, no. 2, July 1980, p. 467-481.

Astronomy and Astrophysics

Astrophysics

1

Cyclotron Frequency, Earth Magnetosphere, Magnetohydrodynamic Stability, Nonuniform Plasmas, Plasma Waves, Proton Resonance, Magnetically Trapped Particles, Plasma Loss, Plasma-Particle Interactions, Solar Protons, Wave Dispersion

Scientific paper

A study of the waves propagating nearly transverse to the ambient magnetic field in an inhomogeneous plasma at frequencies near the harmonics of the proton-cyclotron frequency is presented. Three types of drift cyclotron instabilities were investigated: (1) nonflute instability, (2) delta-B resonant instability, and (3) nonresonant instability. It was found that increases of loss-cone and density gradient increase the growth rates of all three instabilities; increases in the positive temperature gradient and the ratio of thermal pressure of trapped protons to magnetic field pressure have a stabilizing effect on the nonflute and nonresonant instabilities and a destabilizing effect on the delta B-resonant instability. These instabilities can play an important role in the dynamics of the ring current and the inner edge of the plasma sheet region of the magnetosphere; the discrete turbulence generated by them would give rise to precipitation of protons on the auroral field lines, which may contribute to the excitation of diffuse aurora.

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