Evolution of magnetic configurations in the plasma sheet during a substorm on March 19, 1978

Details Evolution of magnetic configurations in the plasma sheet during a substorm on March 19, 1978 Evolution of magnetic configurations in the plasma sheet during a substorm on March 19, 1978

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615831s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,831-15,839.

Physics

7

Current Sheets, Field Aligned Currents, Magnetic Field Configurations, Magnetic Storms, Plasma Layers, Atmospheric Models, Convection Currents, Earth Ionosphere, Magnetosphere-Ionosphere Coupling

Scientific paper

A kinematic model for the evolution of the magnetic field in the plasma sheet produced by an intense substorm on March 19, 1978, is presented. The field-aligned currents in the model are determined from the ground-based magnetometer data with a time resolution of 5 min. The substorm field-aligned currents are assumed to close in the plasma sheet to complete the substorm current circuit. It is shown that the magnetic field produced by the substorm current system in the model can reproduce several important substorm signatures observed in the plasma sheet. The model demonstrates that the ionosphere, in response to an enhanced magnetospheric convection, can cause the plasma sheet to change its magnetic configuration to result in the substorm signatures observed in the plasma sheet. It is shown that it is possible for the ionosphere to play an active role in causing the observed reconfigurations of the plasma sheet during substorms.

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