Field-Aligned-Current Signatures of Externally Driven Reconnection and Reconnection Induced by Anomalous Resistivity

Details Field-Aligned-Current Signatures of Externally Driven Reconnection and Reconnection Induced by Anomalous Resistivity Field-Aligned-Current Signatures of Externally Driven Reconnection and Reconnection Induced by Anomalous Resistivity

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm42c..02p&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM42C-02

Other

2708 Current Systems (2409), 2744 Magnetotail, 2764 Plasma Sheet, 7835 Magnetic Reconnection

Scientific paper

The classical model of substorm onset involves a partial diversion of the cross-tail current in the magnetotail along field lines into the ionosphere on the dawn side, through the westward electrojet, and then back up along field lines to the tail on the dusk side---the substorm current wedge [McPherron et al., 1973]. On the other hand, collisionless reconnection along an extended neutral line leads to a pattern of in-plane Hall currents that produce a coaxial field-aligned-current (FAC) system in a meridian plane. These contrasting FAC patterns are compared to the results of 3-D particle-in-cell simulations of two processes that are freqently proposed as models for substorm onset: reconnection due to anomalous resistivity generated by local current-driven wave turbulence and localized reconnection driven by an externally imposed convection electric field. In the former case the cross-tail current is forced to flow around the reconnection region---either to the ionosphere or tailward---by a periodic blocking procedure. In the latter case tailward propagation of magnetic flux away from a y dependent magnetic field structure leads to the local reconnection. The nature of the FAC systems for the two cases will be discussed.

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