Physics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..749m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, May 1990, p. 749-752. Research supported by the Yamada Science Foundatio
Physics
42
Earth Magnetosphere, Kelvin-Helmholtz Instability, Magnetohydrodynamic Stability, Shear Flow, Supersonic Flow, Computerized Simulation, Eigenvectors, Extremely Low Radio Frequencies, Geomagnetic Tail, Kinetic Energy, Magnetosheath
Scientific paper
It is demonstrated by means of an MHD simulation that a finite thick velocity shear layer with super-Alfvenic velocity jump is unstable to the Kelvin-Helmholtz (KH) instability no matter how large the sonic Mach number, a result suggesting that the tail flank boundary is unstable to the KH instability. For supersonic shear flow the unstable mode becomes damped-oscillatory in the magnetosheath. For both subsonic and supersonic shear flows, the energy flux density into the magnetosphere by the KH instability is large enough to replenish the plasma in the low latitude boundary layer with the tailward flow kinetic energy of observed intensity. A significant fraction of the energy flux density can reach deeper into the magnetosphere and its intensity is comparable to an energy flux density required for excitation of a ULF wave in the magnetosphere.
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