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| Titel |
Association of radiation belt electron enhancements with earthward penetration of Pc5 ULF waves: a case study of intense 2001 magnetic storms |
| VerfasserIn |
M. Georgiou, I. A. Daglis, E. Zesta, G. Balasis, I. R. Mann, C. Katsavrias, K. Tsinganos |
| 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 ; 33, no. 11 ; Nr. 33, no. 11 (2015-11-20), S.1431-1442 |
| Datensatznummer |
250121271
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| Publikation (Nr.) |
 copernicus.org/angeo-33-1431-2015.pdf |
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| Zusammenfassung |
| Geospace magnetic storms, driven by the solar wind, are associated with
increases or decreases in the fluxes of relativistic electrons in the outer
radiation belt. We examine the response of relativistic electrons to four
intense magnetic storms, during which the minimum of the Dst index ranged
from −105 to −387 nT, and compare these with concurrent observations of
ultra-low-frequency (ULF) waves from the trans-Scandinavian IMAGE
magnetometer network and stations from multiple magnetometer arrays available
through the worldwide SuperMAG collaboration. The latitudinal and global
distribution of Pc5 wave power is examined to determine how deep into the
magnetosphere these waves penetrate. We then investigate the role of Pc5 wave
activity deep in the magnetosphere in enhancements of radiation belt
electrons population observed in the recovery phase of the magnetic storms.
We show that, during magnetic storms characterized by increased post-storm
electron fluxes as compared to their pre-storm values, the earthward shift of
peak and inner boundary of the outer electron radiation belt follows the Pc5 wave activity, reaching L shells as low as 3–4. In contrast, the one magnetic
storm characterized by irreversible loss of electrons was related to limited
Pc5 wave activity that was not intensified at low L shells. These
observations demonstrate that enhanced Pc5 ULF wave activity penetrating deep
into the magnetosphere during the main and recovery phase of magnetic storms
can, for the cases examined, distinguish storms that resulted in increases in
relativistic electron fluxes in the outer radiation belts from those that did
not. |
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