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CUTLASS HF radar observations of high-latitude azimuthally propagating vortical currents in the nightside ionosphere during magnetospheric substorms

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<mark>Journal publication date</mark>06/2000
<mark>Journal</mark>Annales Geophysicae
Issue number6
Number of pages13
Pages (from-to)640-652
Publication StatusPublished
<mark>Original language</mark>English


High-time resolution CUTLASS observations and ground-based magnetometers have been employed to study the occurrence of vortical fl ̄ow 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 field-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.