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| Titel |
Signatures of moving polar cap arcs in the F-region PolarDARN echoes |
| VerfasserIn |
A. V. Koustov, K. Hosokawa, N. Nishitani, K. Shiokawa, H. Liu |
| 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 ; 30, no. 3 ; Nr. 30, no. 3 (2012-03-01), S.441-455 |
| Datensatznummer |
250017192
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| Publikation (Nr.) |
 copernicus.org/angeo-30-441-2012.pdf |
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| Zusammenfassung |
| Joint observations of the all-sky camera at Resolute Bay (Nunavut, Canada)
and the Polar Dual Auroral Radar Network (PolarDARN) HF radars at Rankin
Inlet and Inuvik (Canada) are considered to establish radar signatures of
poleward moving polar cap arcs "detaching" from the auroral oval. Common
features of the events considered are enhanced power or echo occurrence in
the wake of the arcs and enhanced spectral width of these echoes. When the
arcs were oriented along some of the radar beams, velocity reversals at the
arc location were observed with the directions of the arc-associated flows
corresponding to a converging electric field. For the event of 9 December
2007, two arcs were poleward progressing almost along the central beams of
the Inuvik radar at the speed close to the E × B
drift of the bulk of the F-region plasma as inferred from HF Doppler
velocities and from independent measurements by the Resolute Bay ionosonde.
In global-scale convection maps inferred from all Super Dual Auroral Radar
Network (SuperDARN) radar measurements, the polar cap arcs were often seen
close to the reversal line of additional mesoscale convection cells located
poleward of the normal cells related to the auroral oval. |
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