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| Titel |
Rankin Inlet PolarDARN radar observations of duskward moving Sun-aligned optical forms |
| VerfasserIn |
A. Koustov, K. Hosokawa, N. Nishitani, T. Ogawa, K. Shiokawa |
| 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 ; 26, no. 9 ; Nr. 26, no. 9 (2008-09-12), S.2711-2723 |
| Datensatznummer |
250016221
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2711-2008.pdf |
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| Zusammenfassung |
| On 15 February 2007, several duskward moving sun-aligned (SA) auroral forms
have been observed by the all-sky camera at Resolute Bay, Nunavut (Canada).
Concurrent observations with the Rankin Inlet (RANK) PolarDARN HF radar
within the field-of-view of the camera showed signatures of moving auroral
forms in all signal parameters with the most remarkable effects being the
echo power drop and velocity reversal as the arc reached a specific radar
beam/gate. Spatial and temporal variations of the velocity in the vicinity
of the SA form are investigated. It is shown that the form-associated
convection reversal was located poleward (duskward) of the global-scale
convection reversal associated with the dawn cell of the large-scale
convection pattern. Thus, the RANK radar was monitoring the polar cap
portion of the global-scale convection pattern and its transition from the
IMF By<0 to the By>0 situation. Magnetic perturbations
associated with the SA form passing the zenith of several magnetometers are
investigated. It is shown that although magnetometer signatures of the
moving form were clear, the convection pattern derivation from magnetometer
records alone is not straightforward. |
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