Physics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.1519v&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Feb. 1, 1986, p. 1519-1528.
Physics
36
Kelvin-Helmholtz Instability, Magnetohydrodynamic Stability, Magnetohydrodynamic Turbulence, Plasmapause, Shear Flow, Boundary Value Problems, Brunt-Vaisala Frequency, Earth Magnetosphere, Plasma Drift, Rayleigh Waves, Taylor Instability
Scientific paper
A unified linear electromagnetic analysis of both the Kelvin-Helmholtz (shear flow) instability and of the ballooning (interchange) instability is carried out on the basis of MHD theory. In the analysis, the concept of the Richardson instability of hydrodynamic flows is extended into the hydromagnetic context by unifying both the shear flow and the ballooning instability. As essential concept of the analysis is the role played by the magnetic buoyancy due to an effective gravity produced by the curvature of the field lines which provides the basic step by which both instabilities could be coupled. The results of the study are applied to the plasmapause to explain the excitation of hydromagnetic waves in that region, including the effect of the hot particles from the plasma sheet.
Madden Theodore R.
Viñas Adolfo F.
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