Substorm currents - Growth phase and onset

Details Substorm currents - Growth phase and onset Substorm currents - Growth phase and onset

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.7471k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, July 1, 1987, p. 7471-7486.

Physics

207

Atmospheric Models, Geomagnetic Tail, Magnetic Field Configurations, Magnetic Storms, Plasma Currents, Electromagnetic Interactions, Ion Injection, Night Sky, Plasma Drift

Scientific paper

Magnetic field models are used here to study electric currents that flow during growth phases and onsets of magnetospheric substorms. Large cross-tail currents between altitudes of about 7 and 10 earth radii are required near midnight during growth phase in order to produce the observed magnetic field perturbations at synchronous altitude. The required current can be carried by the drift of a particle population whose energy density is about 20 keV/cu cm. This energy density is frequently present at synchronous altitude after injection events. However, the model calculations require establishment of the large currents beyond synchronous altitude during growth phase, and no substantial flux increases during growth phase within the region of interest could be found. A partial explanation for this problem is proposed.

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