Reconnection layer at the flank magnetopause in the presence of shear flow

Details Reconnection layer at the flank magnetopause in the presence of shear flow Reconnection layer at the flank magnetopause in the presence of shear flow

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..855l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 10, p. 855-858

Physics

17

Environment Models, Flow Velocity, Interplanetary Magnetic Fields, Magnetic Field Reconnection, Magnetohydrodynamic Flow, Magnetopause, Magnetosheath, Plasma Waves, Shear Flow, Solar Wind, Computerized Simulation, Mathematical Models, Solar Terrestrial Interactions

Scientific paper

We present hybrid simulations of reconnection layer at the flank magnetopause, where a large plasma flow speed is present in the magnetosheath. It is found that there exists a threshold flow speed v(sub *) such that for the magnetosheath flow speed v(sub s) less than v(sub *) (v(sub s) greater than v(sub *)), the rotational discontinuity with a larger field rotation angle exists on the magnetosheath (magnetospheric) side of the reconnection layer. The threshold speed is found to be v(sub *) = v(sub Am) - v(sub As), where v(sub Am) (v(sub As)) is the Alfven speed on the magnetospheric (magnetosheath) side of the reconnection layer. Furthermore, for v(sub s) much less than v(sub *), the rotational discontinuity on the magnetosheath side is very thin, and an accelerated high-speed flow is located earthward of the rotational discontinuity, as observed at the dayside magnetopause. For v(sub s) approximately v(sub *), the magnetic field transition region is thick, and the accelerated flow is present in the entire field transition region, as observed at the flank magnetopause.

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