Physics
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10127317f&link_type=abstract
Journal of Geophysical Research, Volume 101, Issue A12, p. 27317-27326
Physics
38
Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Interplanetary Physics: Mhd Waves And Turbulence
Scientific paper
A linear analysis of the Kelvin-Helmholtz instability is performed by assuming that one of the plasma regimes (magnetosphere) separated by a velocity shear layer of zero thickness is spatially nonuniform. The previous theories based on the semi-infinite uniform model with infinitesimally thin magnetopause showed that wave growth due to the Kelvin-Helmholtz instability exhibits monotonic increase for shorter frequency. This finding implies that no monochromatic waves whose spatial scales are as large as the magnetospheric size are generated by the Kelvin-Helmholtz instability. In contrast, the present analysis reveals that the Kelvin-Helmholtz instability generates global-scale monochromatic waves when the magnetosphere is nonuniform and the magnetosheath flow speed is quite fast. The wave number is given through the dispersion relation of the Kelvin-Helmholtz unstable wave.
Fujita Shigeo
Glassmeier Karl-Heintz
Kamide Kenji
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