Physics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.7431m&link_type=abstract
Journal of Geophysical Research, vol. 87, Sept. 1, 1982, p. 7431-7444.
Physics
224
Kelvin-Helmholtz Instability, Magnetohydrodynamic Stability, Solar Wind, Space Plasmas, Compressible Fluids, Eigenvalues, Magnetopause, Solar Terrestrial Interactions
Scientific paper
A general stability analysis is given of the Kevin-Helmholtz instability, for the case of sheared MHD flow of finite thickness in a compressible plasma which allows for the arbitrary orientation of the magnetic field, velocity flow, and wave vector in the plane perpendicular to the velocity gradient. The stability problem is reduced to the solution of a single second-order differential equation including a gravitational term to represent the coupling between the Kelvin-Helmholtz mode and the interchange mode. Compressibility and a magnetic field component parallel to the flow are found to be stabilizing effects, with destabilization of only the fast magnetosonic mode in the transverse case, and the presence of both Alfven and slow magnetosonic components in the parallel case. Analysis results are used in a discussion of the stability of sheared plasma flow at the magnetopause boundary and in the solar wind.
Miura Akira
Pritchett Philip L.
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