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| Titel |
Coordinated interhemispheric SuperDARN radar observations of the ionospheric response to flux transfer events observed by the Cluster spacecraft at the high-latitude magnetopause |
| VerfasserIn |
J. A. Wild, S. E. Milan, S. W. H. Cowley, M. W. Dunlop, C. J. Owen, J. M. Bosqued, M. G. G. T. Taylor, J. A. Davies, Mark Lester, N. Sato, A. S. Yukimatu, A. N. Fazakerley, A. Balogh, H. Rème |
| 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 ; 21, no. 8 ; Nr. 21, no. 8, S.1807-1826 |
| Datensatznummer |
250014679
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| Publikation (Nr.) |
 copernicus.org/angeo-21-1807-2003.pdf |
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| Zusammenfassung |
At 10:00 UT on 14
February 2001, the quartet of ESA Cluster spacecraft were approaching the
Northern Hemisphere high-latitude magnetopause in the post-noon sector on an
outbound trajectory. At this time, the interplanetary magnetic field incident
upon the dayside magnetopause was oriented southward and duskward (BZ negative,
BY positive), having turned from a northward orientation just over 1 hour
earlier. As they neared the magnetopause the magnetic field, electron, and ion
sensors on board the Cluster spacecraft observed characteristic field and
particle signatures of magnetospheric flux transfer events (FTEs). Following
the traversal of a boundary layer and the magnetopause, the spacecraft went on
to observe further signatures of FTEs in the magnetosheath. During this
interval of ongoing pulsed reconnection at the high-latitude post-noon
magnetopause, the footprints of the Cluster spacecraft were located in the
fields-of-view of the SuperDARN Finland and Syowa East radars located in the
Northern and Southern Hemispheres, respectively. This study extends upon the
initial survey of Wild et al. (2001) by comparing for the first time in situ
magnetic field and plasma signatures of FTEs (here observed by the Cluster 1
spacecraft) with the simultaneous flow modulations in the conjugate ionospheres
in the two hemispheres. During the period under scrutiny, the flow disturbances
in the conjugate ionospheres are manifest as classic "pulsed ionospheric
flows" (PIFs) and "poleward moving radar auroral forms" (PMRAFs).
We demonstrate that the ionospheric flows excited in response to FTEs at the
magnetopause are not those expected for a spatially limited reconnection
region, somewhere in the vicinity of the Cluster 1 spacecraft. By examining the
large- and small-scale flows in the high-latitude ionosphere, and the
inter-hemispheric correspondence exhibited during this interval, we conclude
that the reconnection processes that result in the generation of PIFs/PMRAFs
must extend over many (at least 4) hours of magnetic local time on the pre- and
post-noon magnetopause.
Key words. Ionosphere (plasma
convection) – Magnetospheric physics (magnetosphere-ionosphere interactions;
magnetospheric configuration and dynamics) |
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