Physics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000angeo..18..640m&link_type=abstract
Annales Geophysicae, vol. 18, Issue 6, pp.640-652
Physics
Scientific paper
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 (sim800 m s-1) associated with Hall currents flowing around upward directed field-aligned currents are frequently observed propagating at high speed (sim1 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.
Marin David
Mikhailov Alexander. V.
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