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| Titel |
Evidence of transient reconnection in the outflow jet of primary reconnection site |
| VerfasserIn |
R. Wang, R. Nakamura, T. Zhang, A. Du, W. Baumjohann, Q. Lu, A. N. Fazakerley |
| 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 ; 32, no. 3 ; Nr. 32, no. 3 (2014-03-14), S.239-248 |
| Datensatznummer |
250121037
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| Publikation (Nr.) |
 copernicus.org/angeo-32-239-2014.pdf |
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| Zusammenfassung |
| The precise mechanism for the formation of magnetic islands in the
magnetotail and the subsequent evolution are still controversial. New
investigations have provided the first observational evidence of secondary
reconnection in the earthward outflow jet of primary reconnection in the
magnetotail. The secondary reconnection takes place 38 c/ωpi
earthward from the primary reconnection site and results in the birth of a
magnetic island observed. This generation mechanism is different from the
widely used model of multiple reconnection X-lines. The duration of the
secondary reconnection was approximate one ion gyration period (5 s). The
observations resemble recent numerical simulations where magnetic
reconnection could spontaneously and transiently happen in the outflow jet,
called secondary reconnection, which was used to explain the formation of
the dipolarization fronts. Coincidentally, another magnetic island moving
earthward passed through three satellites successively. By this chance we
find the magnetic island was accelerated towards Earth with an acceleration
of about 9 km s−2 at −19 RE in the magnetotail. |
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