Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9415113o&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Nov. 1, 1989, p. 15113-15123.
Physics
73
Boundary Layers, Kelvin-Helmholtz Instability, Magnetohydrodynamic Stability, Magnetopause, International Sun Earth Explorers, Magnetosheath
Scientific paper
Observations by the vector electron spectrometer on the ISEE 1 spacecraft are used to directly check the incompressible hydromagnetic stability condition given by Hasegawa (1975), which indicates how stability is influenced by the velocity shear, density ratio, magnetic field, and the direction of the wave vector of the unstable wave mode. The magnetopause is generally found to be stable, by a large margin. In contrast, many cases of marginal stability or instability are found across density transitions in, and at the inner edge of, the boundary layer for wave vectors in plausible directions. It thus appears that the Kelvin-Helmholtz instability is of importance at the inner edge of the magnetospheric boundary layer, as predicted by MHP theory.
Fitzenreiter Richard J.
Ogilvie Keith. W.
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