Simulation of Kelvin-Helmholtz instability at the magnetospheric boundary

Details Simulation of Kelvin-Helmholtz instability at the magnetospheric boundary Simulation of Kelvin-Helmholtz instability at the magnetospheric boundary

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.3195m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, April 1, 1987, p. 3195-3206.

Physics

106

Atmospheric Boundary Layer, Coulomb Collisions, Earth Magnetosphere, Kelvin-Helmholtz Instability, Magnetohydrodynamic Stability, Electric Fields, Magnetic Fields, Magnetohydrodynamic Flow, Magnetosheath, Polar Caps, Solar Wind

Scientific paper

The Miura (1985) model of Kelvin-Helmholtz (K-H) instability at the magnetospheric boundary is extended by including gradients of plasma and magnetic field normal to the magnetopause. The results of simulations indicate that the magnetopause current layer is highly nonlinearly corrugated by the K-H instability, with the degree of corrugation increasing with the increase of the magnetosheath Alfven Mach number M(A). The wavelength and the wave period of the K-H instability are in good agreement with the observations of the boundary oscillations at the magnetopause. The anomalous viscosity that was obtained is just the right magnitude for driving magnetospheric convection in the terrestrial magnetosphere; the magnitude of the anomalous viscosity depends importantly on the M(A).

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