Interchange instability of the earth's plasmapause

Details Interchange instability of the earth's plasmapause Interchange instability of the earth's plasmapause

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9517187h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Oct. 1, 1990, p. 17187-17198.

Physics

13

Cold Plasmas, Earth Atmosphere, Electrostatic Waves, Plasma Drift, Plasmapause, Space Plasmas, Ionospheric Conductivity, Liouville Equations, Low Frequencies, Magnetic Fields, Night

Scientific paper

The factors that affect the interchange instability of the earth's plasmapause are investigated using an extension of Richmond's (1973) procedure based on computing individual particle motions. The effects of particle inertia, centrifugal force, and gravity are estimated. A general differential equation is derived for the time variation of the perturbation potential characterizing an electrostatic ripple with no field-aligned potential drop, which can be solved as an eigenvalue problem to find the linear growth rate. Approximate analytic solutions to this equation were obtained from which it was deduced that the interchange instability is caused by the sharp change in plasma pressure at the plasmapause; its growth rate is limited by ionospheric conductivity and, for very short wavelengths, by the inertia of the magnetospheric particles.

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