Magnetotail reconnection - Current diversion and field-aligned currents

Details Magnetotail reconnection - Current diversion and field-aligned currents Magnetotail reconnection - Current diversion and field-aligned currents

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..733s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, April 1991, p. 733-736. DFG-supported research.

Physics

34

Current Sheets, Field Aligned Currents, Geomagnetic Tail, Magnetic Field Configurations, Magnetic Field Reconnection, Current Density, Electric Current, Magnetic Storms, Magnetohydrodynamics

Scientific paper

A three-dimensional resistive and compressible MHD code to study reconnection in a magnetotail configuration is used. The initial state is a two-dimensional equilibrium with a northward magnetic field component Bz across the current sheet. Reconnection is initiated by applying a finite resistivity localized in the near-earth region with a finite extent in the dawn-dusk direction. The inflow of plasma in the equatorial plane into the reconnection region from dawn and dusk and the divergence of the fast earthward and tailward flow from the reconnection region toward dawn and dusk leads to a magnetic shear. Both this shear and the dipolarization over a limited dawn-dusk extent are responsible for region 1 field-aligned currents earthward and tailward of the neutral line. The occurrence of the shear is independent of a particular initial equilibrium, i.e., region 1 field-aligned currents will also occur during reconnection in a one-dimensional current sheet when the reconnection line has a limited extent.

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