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| Titel |
3D reconnection due to oblique modes: a simulation of Harris current sheets |
| VerfasserIn |
G. Lapenta, J. U. Brackbill |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 7, no. 3/4 ; Nr. 7, no. 3/4, S.151-158 |
| Datensatznummer |
250004251
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| Publikation (Nr.) |
 copernicus.org/npg-7-151-2000.pdf |
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| Zusammenfassung |
| Simulations in three
dimensions of a Harris current sheet with mass ratio, mi/me
= 180, and current sheet thickness, pi/L = 0.5, suggest the existence
of a linearly unstable oblique mode, which is independent from either the
drift-kink or the tearing instability. The new oblique mode causes reconnection
independently from the tearing mode. During the initial linear stage, the system
is unstable to the tearing mode and the drift kink mode, with growth rates that
are accurately described by existing linear theories. How-ever, oblique modes
are also linearly unstable, but with smaller growth rates than either the
tearing or the drift-kink mode. The non-linear stage is first reached by the
drift-kink mode, which alters the initial equilibrium and leads to a change in
the growth rates of the tearing and oblique modes. In the non-linear stage, the
resulting changes in magnetic topology are incompatible with a pure tearing
mode. The oblique mode is shown to introduce a helical structure into the
magnetic field lines. |
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