Coupling of shear flow and pressure gradient instabilities

Details Coupling of shear flow and pressure gradient instabilities Coupling of shear flow and pressure gradient instabilities

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...102.9639v&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A5, p. 9639-9650

Physics

Plasma Physics

31

Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Plasma Sheet, Space Plasma Physics: Kinetic And Mhd Theory, Space Plasma Physics: Numerical Simulation Studies

Scientific paper

The nonlinear dynamics of a shear flow and its subsequent evolution in the equatorial plane of the inner plasma sheet is studied. A linear analysis of the ideal MHD equations reveals a hybrid vortex instability which appears because of the coupling of Kelvin-Helmholtz (KH) and Rayleigh-Taylor instabilities. The hybrid vortex mode grows faster than a KH mode, extracts ambient potential energy, and leads to vortex cells that have a larger spatial extent than a simple KH vortex. In the nonlinear stage, vortices become surge-like and may destroy the shear flow region. The relevance of this model to vortex generation and auroral arc intensifications at the inner edge of the plasma sheet is discussed.

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