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| Titel |
Observation of an inner magnetosphere electric field associated with a BBF-like flow and PBIs |
| VerfasserIn |
T. Johansson, J. W. Bonnell, C. Cully, E. Donovan, J. Raeder, S. Eriksson, L. Andersson, R. E. Ergun, V. Angelopoulos, J. McFadden, K.-H. Glassmeier, I. Mann |
| 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 ; 27, no. 4 ; Nr. 27, no. 4 (2009-04-02), S.1489-1500 |
| Datensatznummer |
250016475
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| Publikation (Nr.) |
 copernicus.org/angeo-27-1489-2009.pdf |
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| Zusammenfassung |
| Themis E observed a perpendicular (to the magnetic field) electric field
associated with an Earthward plasma flow at XGSM=−9.6 RE on 11 January
2008. The electric field observation resembles Cluster observations
closer to Earth in the auroral region. The fast plasma flow shared some
characteristics with bursty bulk flows (BBFs) but did not meet the usual
criteria in maximum velocity and duration to qualify as one. Themis C
observed the same flow further downtail but Themis D, separated by only 1 RE
in azimuthal direction from Themis E, did not. At the time of the
electric field and ion flow event, the all-sky imager and ground-based
magnetometer at Rankin Inlet observed Poleward Boundary Intensifications
(PBIs) and a negative bay signature. None of the other Themis ground-based
observatories recorded any significant auroral or magnetic field activity,
indicating that this was a localized activity. The joint Themis in situ
and ground-based observations suggest that the two observations are related.
This indicates that auroral electric fields can extend to regions much
farther out than previously seen in Cluster observations. |
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