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| Titel |
Coordinated ground-based, low altitude satellite and Cluster observations on global and local scales during a transient post-noon sector excursion of the magnetospheric cusp |
| VerfasserIn |
H. J. Opgenoorth, M. Lockwood, D. Alcaydé, E. Donovan, M. J. Engebretson, A. P. Eyken, K. Kauristie, Mark Lester, J. Moen, J. Waterman, H. Alleyne, M. André, M. W. Dunlop, N. Cornilleau-Wehrlin, A. Masson, A. Fazerkerley, H. Rème, R. André, O. Amm, A. Balogh, R. Behlke, P. L. Blelly, H. Boholm, E. Borälv, J. M. Bosqued, S. Buchert, M. Candidi, J. C. Cerisier, C. Cully, W. F. Denig, P. Eglitis, R. A. Greenwald, B. Jackal, J. D. Kelly, I. Krauklis, G. Lu, I. R. Mann, M. F. Marcucci, I. W. McCrea, M. Maksimovic, S. Massetti, P. M. E. Décréau, D. K. Milling, S. Orsini, F. Pitout, G. Provan, J. M. Ruohoniemi, J. C. Samson, J. J. Schott, F. Sedgemore-Schulthess, R. Stamper, P. Stauning, A. Strømme, M. Taylor, A. Vaivads, J. P. Villain, I. Voronkov, J. A. Wild, M. Wild |
| 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 ; 19, no. 10/12 ; Nr. 19, no. 10/12, S.1367-1398 |
| Datensatznummer |
250014120
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| Publikation (Nr.) |
 copernicus.org/angeo-19-1367-2001.pdf |
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| Zusammenfassung |
On 14 January 2001, the
four Cluster spacecraft passed through the northern magnetospheric mantle in
close conjunction to the EISCAT Svalbard Radar (ESR) and approached the
post-noon dayside magnetopause over Green-land between 13:00 and 14:00 UT.
During that interval, a sudden reorganisation of the high-latitude dayside
convection pattern occurred after 13:20 UT, most likely caused by a direction
change of the Solar wind magnetic field. The result was an eastward and
poleward directed flow-channel, as monitored by the SuperDARN radar network and
also by arrays of ground-based magnetometers in Canada, Greenland and
Scandinavia. After an initial eastward and later poleward expansion of the
flow-channel between 13:20 and 13:40 UT, the four Cluster spacecraft, and the
field line footprints covered by the eastward looking scan cycle of the Söndre
Strömfjord incoherent scatter radar were engulfed by cusp-like precipitation
with transient magnetic and electric field signatures. In addition, the EISCAT
Svalbard Radar detected strong transient effects of the convection
reorganisation, a poleward moving precipitation, and a fast ion flow-channel in
association with the auroral structures that suddenly formed to the west and
north of the radar. From a detailed analysis of the coordinated Cluster and
ground-based data, it was found that this extraordinary transient convection
pattern, indeed, had moved the cusp precipitation from its former pre-noon
position into the late post-noon sector, allowing for the first and quite
unexpected encounter of the cusp by the Cluster spacecraft. Our findings
illustrate the large amplitude of cusp dynamics even in response to moderate
solar wind forcing. The global ground-based data proves to be an invaluable
tool to monitor the dynamics and width of the affected magnetospheric regions.
Key words. Magnetospheric cusp,
ionosphere, reconnection, convection flow-channel, Cluster, ground-based
observations |
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