Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm12b..06g&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM12B-06
Physics
2778 Ring Current, 2788 Storms And Substorms
Scientific paper
The coupling between plasma populations, namely, the ring current and the plasma sheet, is analyzed in the frame of study on the storm-time ring current response and development under the influence of substorm-associated electric fields. We model the proposed periods of April-June 2001 and April 2002 storm. We trace particles with arbitrary pitch angles numerically in the drift approximation. Tracing is performed in different realistic time-dependent magnetic and electric field models. Substorm-associated electric field is given by Gaussian pulse with azimuthal field component propagating inward with a velocity dependent on radial distance. The magnetic field from this pulse is calculated by Faraday's law. We model particle inward motion and energization by a series of electric field pulses representing substorm activations during storm events. The obtained model Dst index, energy density and particle flux maps are then compared to ground-based and satellite observations such as ground-based magnetic field and IMAGE, LANL, CLUSTER particle measurements. The role of substorm-associated fields in the energization of the plasma sheet particles to higher energies (more than 100 keV) and their transport inward to closed drift shells is closely studied.
Ganushkina Natalia Yu.
Pulkkinen T. T.
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