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| Titel |
The effects of an interplanetary shock on the high-latitude ionospheric convection during an IMF By-dominated period |
| VerfasserIn |
I. Coco, E. Amata, M. F. Marcucci, D. Ambrosino, J.-P. Villain, C. Hanuise |
| 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 (2008-09-25), S.2937-2951 |
| Datensatznummer |
250016240
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2937-2008.pdf |
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| Zusammenfassung |
| On 6 January 1998 an interplanetary shock hit the magnetosphere around 14:15 UT
and caused a reconfiguration of the northern high-latitude ionospheric
convection. We use SuperDARN, spacecraft and ground magnetometer data to
study such reconfiguration. We find that the shock front was tilted towards
the morning flank of the magnetosphere, while the Interplanetary Magnetic
Field (IMF) was By-dominated, with By<0, IMF Bz>0
and |By|>>Bz. As expected, the magnetospheric compression
started at the first impact point of the shock on the magnetopause causing an
increase of the Chapman-Ferraro current from dawn to dusk and yielding an
increase of the geomagnetic field at the geostationary orbit and on the
ground. Moreover, the high-latitude magnetometer data show vortical
structures clearly related to the interaction of the shock with the
magnetosphere-ionosphere system. In this context, the SuperDARN convection
maps show that at very high latitudes above the northern Cusp and in the
morning sector, intense sunward convection fluxes appear, well correlated in
time with the SI arrival, having a signature typical for Bz>0
dominated lobe reconnection. We suggest that in this case the dynamic
pressure increase associated to the shock plays a role in favouring the
setting up of a new lobe merging line albeit |By|>>Bz≥0. |
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