CUTLASS HF radar observations of high-latitude azimuthally propagating vortical currents in the nightside ionosphere during magnetospheric substorms |
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Authors: | J. A. Wild T. K. Yeoman |
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Affiliation: | (1) Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK |
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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–1) associated with Hall currents flowing around upward directed field-aligned currents are frequently observed propagating at high speed ( 1 km s–1) 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. |
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Keywords: | Ionosphere (auroral ionosphere electric fields and currents) Magnetospheric physics (storms and substorms) |
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