Substorm observations in the early morning sector with Equator-S and Geotail

Details Substorm observations in the early morning sector with Equator-S and Geotail Substorm observations in the early morning sector with Equator-S and Geotail

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999angeo..17.1602n&link_type=abstract

Annales Geophysicae, vol. 17, Issue 12, pp.1602-1610

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Scientific paper

Data from Equator-S and Geotail are used to study the dynamics of the plasma sheet observed during a substorm with multiple intensifications on 25 April 1998, when both spacecraft were located in the early morning sector (03-04 MLT) at a radial distance of 10-11 RE. In association with the onset of a poleward expansion of the aurora and the westward electrojet in the premidnight and midnight sector, both satellites in the morning sector observed plasma sheet thinning and changes toward a more tail-like field configuration. During the subsequent poleward expansion in a wider local time sector (20-04 MLT), on the other hand, the magnetic field configuration at both satellites changed into a more dipolar configuration and both satellites encountered again the hot plasma sheet. High-speed plasma flows with velocities of up to 600 km/s and lasting 2-5 min were observed in the plasma sheet and near its boundary during this plasma sheet expansion. These high-speed flows included significant dawn-dusk flows and had a shear structure. They may have been produced by an induced electric field at the local dipolarization region and/or by an enhanced pressure gradient associated with the injection in the midnight plasma sheet.

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