Nightside Plasmasphere Variations Produced by the Stortime Ring Current

Details Nightside Plasmasphere Variations Produced by the Stortime Ring Current Nightside Plasmasphere Variations Produced by the Stortime Ring Current

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm42e..02l&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM42E-02

Physics

2712 Electric Fields (2411), 2753 Numerical Modeling, 2768 Plasmasphere, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

A potential well is created in the nightside subauroral ionosphere by the closure currents of the stormtime partial ring current. The force of this electric field is self-consistently included in a simulation of the inner magnetospheric plasma dynamics. The presentation will focus on the magnetic storm of May 24, 2000, which was the first magnetic storm seen by the IMAGE satellite, providing global snapshots of the ring current and plasmasphere. Asymmetric hot ion morphologies persist through the main phase and into the recovery, indicating that strong field-aligned closure currents must be present, creating the anomalous potential well. It is seen that the feedback of this electric field on the ring current ions limits the size of the potential drop, and also reconfigures the pattern (compared with the results without feedback). Intense electric fields still persist at midlatitudes throughout the main phase of the storms, rapidly eroding the nightside plasmasphere. EUV observations show that the nightside outer plasmasphere (the region connected to the plasmaspheric tail) was significantly depleted during the main phase of the storm. The influence of the enhanced drift on plasmaspheric densities is examined and quantified.

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