Mathematics – Logic
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.6069a&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 6069-6078.
Mathematics
Logic
83
Auroral Zones, Dynamics Explorer Satellites, Luminous Intensity, Magnetic Storms, Plasma Drift, Electron Energy, Energetic Particles, Field Aligned Currents, Satellite-Borne Instruments
Scientific paper
The temporal relationship between subauroral ion drifts (SAIDs) and the phases of an auroral substorm is examined on the basis of multisatellite data. The time of expansive phase onset is identified and the time at which recovery begins is estimated. SAIDs are found to typically occur well after substorm onset (more than 30 min), during the substorm recovery phase. Substantial westward ion drifts and field-aligned currents are observed well equatorward of the auroral oval during the expansion phase of a substorm, but the drifts lack the narrow spike signature associated with SAIDs. A phenomenological model of SAID production that qualitatively agrees with the observed ionospheric signatures and substorm temporal relationship is proposed.
Anderson Philip C.
Baker Daniel N.
Craven John D.
Frank Louis A.
Hanson William B.
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