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| Titel |
CUTLASS HF radar observations of high-latitude azimuthally propagating vortical currents in the nightside ionosphere during magnetospheric substorms |
| VerfasserIn |
J. A. Wild, T. K. Yeoman |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 18, no. 6 ; Nr. 18, no. 6, S.640-652 |
| Datensatznummer |
250014019
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| Publikation (Nr.) |
 copernicus.org/angeo-18-640-2000.pdf |
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| Zusammenfassung |
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.
Key words: Ionosphere (auroral ionosphere; electric
fields and currents) · Magnetospheric physics (storms and substorms) |
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