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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
Sprache Englisch
ISSN 0992-7689
Digitales Dokument URL
Erschienen In: Annales Geophysicae ; 22, no. 7 ; Nr. 22, no. 7 (2004-07-14), S.2577-2585
Datensatznummer 250014947
Publikation (Nr.) Volltext-Dokument vorhandencopernicus.org/angeo-22-2577-2004.pdf
 
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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