Generation of vortex-induced tearing mode instability at the magnetopause

Details Generation of vortex-induced tearing mode instability at the magnetopause Generation of vortex-induced tearing mode instability at the magnetopause

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510559p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10559-10566. Research supported by the National Natu

Physics

27

Magnetic Field Reconnection, Magnetohydrodynamic Stability, Magnetopause, Tearing Modes (Plasmas), Vortices, Quasi-Steady States, Reynolds Number, S Waves

Scientific paper

A two-dimensional MHD simulation is performed to study the generation of the vortex-induced tearing mode instability at the magnetopause. When a sheared magnetic field exists along with the velocity shear, the tearing mode will couple with the Kelvin-Helmholtz (K-H) instability. The shear Alfven Mach number M(A) plays an essential role in determining the linear properties and nonlinear evolution of the coupled instability. When the magnetic field is fixed, if M(A) is below 0.4, the spontaneous tearing mode is dominated. When M(A) is between 0.4 and 1, the tearing mode is apparently modified by the K-H instability. When M(A) is greater than 1 the coupled instability, called the vortex-induced tearing mode instability, appears to be intrinsically different from the conventional tearing mode instability.

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