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| Titel |
SuperDARN Hokkaido radar observation of westward flow enhancement in subauroral latitudes |
| VerfasserIn |
R. Kataoka, K. Hosokawa, N. Nishitani, Y. Miyoshi |
| 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 ; 27, no. 4 ; Nr. 27, no. 4 (2009-04-07), S.1695-1699 |
| Datensatznummer |
250016492
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| Publikation (Nr.) |
 copernicus.org/angeo-27-1695-2009.pdf |
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| Zusammenfassung |
| Westward flow enhancement in subauroral latitudes is investigated based
on the first one and a half year observation of the SuperDARN Hokkaido
radar. A total of 15 events are identified with the criteria of westward
flow speed of >1.0 km/s in magnetic latitude from 45 to 65 deg during
geomagnetically disturbed period of Kp>3+ at 20 magnetic local time. It is
found that especially during the storm recovery phase, the flow enhancement
occurs in broad range of Dst amplitude, and the occurrence latitude depends
on the amplitude of Dst. It is also found that the disturbed Kp condition is
not sufficient for the appearance of the subauroral flow enhancement as seen
by Hokkaido radar while storm-like Dst condition is necessary, supporting
the idea that ring current particles play an essential role to enhance the
westward flow in subauroral latitudes via magnetosphere-ionosphere coupling
through the field-aligned current. |
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