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Data from Equator-S and Geotail are used tostudy the dynamics of the plasma sheet observed during a substorm with multipleintensifications on 25 April 1998, when both spacecraft were located in theearly 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 thewestward electrojet in the premidnight and midnight sector, both satellites inthe morning sector observed plasma sheet thinning and changes toward a moretail-like field configuration. During the subsequent poleward expansion in awider local time sector (20–04 MLT), on the other hand, the magnetic fieldconfiguration at both satellites changed into a more dipolar configuration andboth satellites encountered again the hot plasma sheet. High-speed plasma flowswith velocities of up to 600 km/s and lasting 2–5 min were observed in theplasma sheet and near its boundary during this plasma sheet expansion. Thesehigh-speed flows included significant dawn-dusk flows and had a shear structure.They may have been produced by an induced electric field at the localdipolarization region and/or by an enhanced pressure gradient associated withthe injection in the midnight plasma sheet. Key words. Magnetospheric physics (magnetosphericconfiguration and dynamics; plasma sheet; storms and substorms

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