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| Titel |
Ionospheric plasma density structures associated with magnetopause motion: a case study using the Cluster spacecraft and the EISCAT Svalbard Radar |
| VerfasserIn |
F. Pitout, C. P. Escoubet, E. A. Lucek |
| 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.2369-2379 |
| Datensatznummer |
250014927
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| Publikation (Nr.) |
 copernicus.org/angeo-22-2369-2004.pdf |
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| Zusammenfassung |
| On 5 January 2003, the footprint of the Cluster spacecraft, then orbiting in
the dayside magnetosphere near the magnetopause, was in the close vicinity
of the EISCAT Svalbard Radar (ESR) in the dayside afternoon sector. This
configuration made possible the study of the magnetopause motion and its
direct consequences on the ionospheric plasma at high latitude. Cluster
observed multiple magnetopause crossings despite its high latitude, while on
the ground the magnetic activity was very low, whereas the ionospheric
plasma sounded by the ESR exhibited poleward moving plasma density
structures. In this paper, we compare the satellite and radar data, in order
to show that the plasma density structures are directly related to the
magnetopause motion and its associated pulsed ionospheric flow. We propose
that the variations in electric field make the convection velocity vary
enough to alter the electron population by accelerating the chemistry in the
F-region and act as a source of electron depletion. The magnetopause motion
is in this case, a source of plasma density structures in the polar dayside
ionosphere. |
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