Three-dimensional current system in different phases of a substorm

Details Three-dimensional current system in different phases of a substorm Three-dimensional current system in different phases of a substorm

Aug 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22.1231l&link_type=abstract

Planetary and Space Science, vol. 22, Aug. 1974, p. 1231-1247.

Physics

5

Earth Magnetosphere, Electric Fields, Magnetic Storms, Ring Currents, Auroral Zones, Field Aligned Currents, Interplanetary Magnetic Fields, Ionospheric Currents

Scientific paper

It is assumed that the three-dimensional current system of a substorm passes through three successive stages. When a dawn-to-dusk magnetospheric electric field appears, a current system with field-aligned currents at the poleward boundary of the auroral zone arises. An electric drift of plasma toward the earth leads to the appearance of a westward partial ring current increasing in time, which is closed by field-aligned currents at the equatorward boundary of the auroral zone. An increase in the auroral ionospheric conductivity during the expansive phase produces an increase in all currents and a turning of field-aligned currents at the equatorward boundary of the auroral zone relative to those at the poleward one.

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