Sudden disruption of the cross-tail current associated with onset of fast reconnection in the magnetotail

Physics

Scientific paper

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2723 Magnetic Reconnection (7526, 7835), 2744 Magnetotail, 2790 Substorms

Scientific paper

A Hall MHD simulation is conducted to study substorm dynamic processes beginning with a realistic magnetotail. The simulation results indicate that sudden disruption of cross tail current at the near Earth region <15R_E is triggered by fast magnetic reconnection with the reconnection rate >0.1. We observed all substorm phases: early slow growth phase, late impulsive growth phase, substorm onset, and expansion phase with time scales that well agree with the satellite observational time scales. Substantial increases of parallel electric field, field-aligned currents, and large Earthward bulk flow in this simulation are observed immediately after the substorm onset. Our simulation results can explain most of the satellite observational signatures associated with the substorm.

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