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High-time resolution radar observations of high-latitude flows during an isolated substorm

Research output: Contribution to conferenceOther

Published

Publication date2000
Number of pages0
Original languageEnglish

Conference

ConferenceProceedings of the SuperDARN Workshop
Period1/01/00 → …

Abstract

High-time resolution CUTLASS observations and ground-based magnetometers have been employed to study the occurrence of vortical flow structures propagating through the high-latitude ionosphere during magnetospheric substorms. Fast-moving flow vortices (~800 m/s) associated with Hall currents flowing around upward directed feld-aligned currents are frequently observed propagating at high speed (~1 km/s) azimuthally away from the region of the ionosphere associated with the location of the substorm expansion phase onset. Furthermore, a statistical analysis drawn from over 1000 h of high-time resolution, nightside radar data has enabled the characterisation of the bulk properties of these vortical flow systems. Their occurrence with respect to substorm phase has been investigated and a possible generation mechanism has been suggested.