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| Titel |
Simultaneous optical and radar signatures of poleward-moving auroral forms |
| VerfasserIn |
A. Thorolfsson, J.-C. Cerisier, M. Lockwood, P. E. Sandholt, C. Senior, Mark Lester |
| 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. 9 ; Nr. 18, no. 9, S.1054-1066 |
| Datensatznummer |
250014056
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| Publikation (Nr.) |
 copernicus.org/angeo-18-1054-2000.pdf |
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| Zusammenfassung |
Dayside poleward moving auroral forms (PMAFs)
were detected between 06:30 and 07:00 UT on December 16, 1998, by the meridian
scanning photometer and the all-sky camera at Ny Ålesund, Svalbard.
Simultaneous SuperDARN HF radar measurements permitted the study of the
associated ionospheric velocity pattern. A good general agreement is observed
between the location and movement of velocity enhancements (flow channels) and
the PMAFs. Clear signatures of equatorward flow were detected in the vicinity of
PMAFs. This flow is believed to be the signature of a return flow outside the
reconnected flux tube, as predicted by the Southwood model. The simulated
signatures of this model reproduce globally the measured signatures, and
differences with the experimental data can be explained by the simplifications
of the model. Proposed schemes of the flow modification due to the presence of
several flow channels and the modification of cusp and region 1 field-aligned
currents at the time of sporadic reconnection events are shown to fit well with
the observations.
Key words: Ionosphere (auroral ionosphere; plasma
convection) - Magnetospheric physics
(magnetopause; cusp and boundary layers) |
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