High-Time Resolution Radar Observations of High-Latitude Flows During an Isolated Substorm

J. A. WILD, T. K. YEOMAN and J.A. DAVIES
University of Leicester, UK

On 21^st August 1998 the IMF underwent a southward turning after approximately 20 hours of northward orientation. Shortly after this southward turning a substorm occurred in the Scandinavian sector situated at ~01:00 MLT. Instrumental coverage during this substorm was particularly favourable with both radars of the CUTLASS pair operating in a high-time resolution discretionary mode. In addition the UHF incoherent scatter EISCAT Svalbard Radar and the VHF EISCAT radar located at Tromsø, Norway were operational with all beams being encompassed by the CUTLASS field-of-view. During the substorm recovery phase regions of poleward ionospheric flow reaching ~800 m s^-1 were observed to propagate towards the pole at speeds of ~1100 m s^-1. The electric and magnetic field structure of these features are characterised and their significance to substorm recovery phase processes discussed.

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