A simulation of the storm-time ring current

Details A simulation of the storm-time ring current A simulation of the storm-time ring current

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38.1133t&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 38, Sept. 1990, p. 1133-1141.

Physics

42

Magnetic Storms, Ring Currents, Earth Magnetosphere, Geomagnetic Tail, Geomagnetism, Magnetic Field Configurations

Scientific paper

The formation of a closed ring current from a partial ring current is examined quantitatively by a particle trajectory tracing method. That is, the storm-time ring current was simulated by a model with monochromatic energy and pitch angle distribution using a dipole magnetic field with a time-varying electric field. It is found that the combination of the particle energy and the temporal variation of the cross-tail electric field can generate various patterns of the ring current development. It is also found that the recovery of the ring current is explained by the superposition of the 'flow out' effect and the loss process of trapped particles by charge exchange. The geomagnetic Dst index has been estimated from the particle motions, and results similar to the actual Dst recovery with two different time constants have been obtained.

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