Physics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..969k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 10, May 22, 1992, p. 969-972.
Physics
8
Ionospheric Currents, Magnetic Storms, Models, Convection, Current Sheets, Earth Magnetosphere
Scientific paper
Based on the ionospheric currents determined from ground-based magnetometer data, a global substorm current system is proposed. The proposed substorm current system is composed of (1) the region-1 and -2 currents, (2) the growth-phase current loops, and (3) the substorm current wedge. The growth-phase current loops are initiated during the growth phase due to reconfiguration of the magnetosphere driven by enhanced magnetospheric convection. The substorm current wedge can be initiated by the expansion onset due to the ionospheric response to the enhanced magnetospheric convection. During the growth phase, the current system consists of currents in (1) and (2). During the expansion phase, the substorm current system consists of currents in (1), (2), and (3). Energy dissipated during the substorm expansion phase is supplied by both the directly-driven process and the unloading process. This is supported by the observations that dipolarization occurs inside the current wedge, while thinning proceeds on the dawn and dusk sides of the current wedge.
Akasofu Syuh-Ichi
Iijima Toru
Kan Joseph R.
Potemra Thomas A.
Sun WaiChing
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