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| Titel |
Multi-spacecraft Observations of the Dynamics of the Quasi-parallel Bow Shock |
| VerfasserIn |
H. Hietala, T. V. Laitinen, K. Andréeová, E. K. J. Kilpua, A. Vaivads, M. André, H. E. J. Koskinen, E. A. Lucek, H. Rème |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250023587
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| Zusammenfassung |
| On the evening of 17 March 2007, the four Cluster spacecraft were flying very close to the
nose of the magnetosphere, slightly on the duskside. At the same time Geotail was
approaching the nose of the bow shock, on the dawnside, about 13 Re away from the Cluster.
The solar wind at the time was quite fast, 520-550 km/s, and relatively steady. The position of
the quasi-parallel bow shock seen by Geotail matches well to the one given by models for
the observed solar wind conditions. However, the magnetopause passed over the
Cluster spacecraft several times during a 3 hour period from 17:00 to 20:00 UT.
Some of the outward crossings of the magnetopause were followed by short bow
shock crossings immediately afterwards. Therefore part of the quasi-parallel bow
shock passed through Clusterś location as well. Furthermore, the thickness of the
magnetosheath between the successive crossings was observed to be very small,
only about 1.4 Re. We investigate how and why the quasi-parallel bow shock was
deformed allowing it to be this close to the magnetopause. We are also using data
from the geostationary satellites to detect possible changes in the magnetosphere. |
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