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| Titel |
Global magnetospheric response to an interplanetary shock: THEMIS observations |
| VerfasserIn |
H. Zhang, D. G. Sibeck, Q.-G. Zong, J. P. McFadden, D. Larson, K.-H. Glassmeier, V. Angelopoulos |
| 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 ; 30, no. 2 ; Nr. 30, no. 2 (2012-02-22), S.379-387 |
| Datensatznummer |
250017186
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| Publikation (Nr.) |
 copernicus.org/angeo-30-379-2012.pdf |
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| Zusammenfassung |
| We investigate the global response of the geospace plasma environment to an
interplanetary (IP) shock at ~02:24 UT on 28 May 2008 from multiple
THEMIS spacecraft observations in the magnetosheath (THEMIS B and C), the
mid-afternoon magnetosphere (THEMIS A), and the dusk magnetosphere (THEMIS D
and E). The interaction of the transmitted IP shock with the magnetosphere
has global effects. Consequently, it can affect geospace plasma
significantly. After interacting with the bow shock, the IP shock transmitted
a fast shock and a discontinuity which propagated through the magnetosheath
toward the Earth at speeds of 301 km s−1 and 137 km s−1, respectively. THEMIS A
observations indicate that the IP shock changed the properties of a
plasmaspheric plume significantly. The plasmaspheric plume density increased
rapidly from 10 to 100 cm−3 in 4 min and the ion distribution
changed from an isotropic to a strongly anisotropic distribution.
Electromagnetic ion cyclotron (EMIC) waves observed by THEMIS A are most
likely excited by the anisotropic ion distributions caused by the IP shock
impact. THEMIS A, but not D or E, observed a plasmaspheric plume in the
dayside magnetosphere. Multiple spacecraft observations indicate that the
dawn-side edge of the plasmaspheric plume was located between THEMIS A and D
(or E). |
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