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| Titel |
The structure and dynamics of a large-scale plasmoid generated by fast reconnection in the geomagnetic tail |
| VerfasserIn |
M. Ugai |
| 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 ; 29, no. 1 ; Nr. 29, no. 1 (2011-01-13), S.147-156 |
| Datensatznummer |
250016954
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| Publikation (Nr.) |
 copernicus.org/angeo-29-147-2011.pdf |
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| Zusammenfassung |
| As a sequence of Ugai (2010b), the present
paper studies in detail the structure and dynamics of
large-scale (principal) plasmoid, generated by the
fast reconnection evolution in a sheared current sheet
with no initial northward field
component. The overall plasmoid
domain is divided into the plasmoid reconnection region
P and the plasmoid core region C.
In the region P, the magnetized plasma with
reconnected field lines are accumulated, whereas
in the region C, the plasma, which was intially
embedded in the current sheet and has been ejected away
by the reconnection jet, is compressed and accumulated.
In the presence of the sheared magnetic field in the
east-west direction in the current sheet, the upper and
lower parts of the reconnection region P are
inversely shifted in the east-west directions.
Accordingly, the plasmoid core region C with
the accumulated sheared field lines is bent in the
north-south direction just ahead of
the plasmoid center x=XC, causing the magnetic field
component in the north-south direction, whose sign is
always opposite to that of the reconnected field lines.
Therefore, independently of the sign of the
initial sheared field, the magnetic field component
Bz in the north-south direction has the definite
bipolar profile around XC along
the x-axis. At x=XC,
the sheared field component has the peak value, and
as the sheared fields accumulated in the
region C become larger, the
bipolar field profile becomes more distinct. |
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