Physics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..109s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Jan. 1, 1987, p. 109-116.
Physics
65
Magnetohydrodynamic Stability, Magnetospheric Instability, Planetary Atmospheres, Gravitational Effects, Magnetic Field Configurations, Perturbation Theory, Planetary Rotation, Plasma Density
Scientific paper
The interchange instability is reviewed with particular emphasis on its relevance to planetary magnetospheric processes. Results of earlier work are reviewed and drawn together by the derivation of a general stability condition, based on a small perturbation approach, for a plasma with isotropic pressure contained in a curved magnetic field in the presence of gravity. The results are not restricted to low pressure or special field geometry, and the straight field result is recovered in the appropriate limit. A small perturbation approach is used for the instability analysis. Conditions under which an effective gravity may be introduced to simulate rotational effects are discussed. Recent criticism of the Jovian ring current impoundment hypothesis which was based on the straight field line results is shown to be ill-founded.
Galland Kivelson Margaret
Southwood David J.
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