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| Titel |
Density structures inside the plasmasphere: Cluster observations |
| VerfasserIn |
F. Darrouzet, P. M. E. Décréau, J. Keyser, A. Masson, D. L. Gallagher, O. Santolík, B. R. Sandel, J. G. Trotignon, J. L. Rauch, E. Guirriec, P. Canu, F. Sedgemore, M. André, J. F. Lemaire |
| 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 ; 22, no. 7 ; Nr. 22, no. 7 (2004-07-14), S.2577-2585 |
| Datensatznummer |
250014947
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| Publikation (Nr.) |
 copernicus.org/angeo-22-2577-2004.pdf |
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| Zusammenfassung |
| The electron density profiles derived from the EFW and
WHISPER instruments on board the four Cluster spacecraft reveal density
structures inside the plasmasphere and at its outer boundary, the
plasmapause. We have conducted a statistical study to characterize these
density structures. We focus on the plasmasphere crossing on 11 April
2002, during which Cluster observed several density irregularities inside
the plasmasphere, as well as a plasmaspheric plume. We derive the density
gradient vectors from simultaneous density measurements by the four
spacecraft. We also determine the normal velocity of the boundaries of the
plume and of the irregularities from the time delays between those
boundaries in the four individual density profiles, assuming they are
planar. These new observations yield novel insights about the occurrence of
density irregularities, their geometry and their dynamics. These in-situ
measurements are compared with global images of the plasmasphere from the
EUV imager on board the IMAGE satellite. |
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