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| Titel |
Dual-spacecraft reconstruction of a three-dimensional magnetic flux rope at the Earth's magnetopause |
| VerfasserIn |
H. Hasegawa, B. U. Ö. Sonnerup, S. Eriksson, T. K. M. Nakamura, H. Kawano |
| 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. 2 ; Nr. 33, no. 2 (2015-02-03), S.169-184 |
| Datensatznummer |
250121160
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| Publikation (Nr.) |
 copernicus.org/angeo-33-169-2015.pdf |
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| Zusammenfassung |
| We present the first results of a data analysis method, developed by Sonnerup
and Hasegawa (2011), for reconstructing three-dimensional (3-D),
magnetohydrostatic structures from data taken as two closely spaced
satellites traverse the structures. The method is applied to a magnetic flux
transfer event (FTE), which was encountered on 27 June 2007 by at least
three (TH-C, TH-D, and TH-E) of the five THEMIS probes near the subsolar
magnetopause. The FTE was sandwiched between two oppositely directed
reconnection jets under a southward interplanetary magnetic field condition,
consistent with its generation by multiple X-line reconnection. The
recovered 3-D field indicates that a magnetic flux rope with a diameter of
~ 3000 km was embedded in the magnetopause. The FTE flux rope
had a significant 3-D structure, because the 3-D field reconstructed from
the data from TH-C and TH-D (separated by ~ 390 km) better
predicts magnetic field variations actually measured along the TH-E path
than does the 2-D Grad–Shafranov reconstruction using the data from TH-C
(which was closer to TH-E than TH-D and was at ~ 1250 km from
TH-E). Such a 3-D nature suggests that the field lines reconnected at the
two X-lines on both sides of the flux rope are entangled in a complicated
way through their interaction with each other. The generation process of the
observed 3-D flux rope is discussed on the basis of the reconstruction
results and the pitch-angle distribution of electrons observed in and around
the FTE. |
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