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| Titel |
Two-dimensional MHD model of the reconnection diffusion region |
| VerfasserIn |
N. V. Erkaev, V. S. Semenov, H. K. Biernat |
| 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 ; 9, no. 2 ; Nr. 9, no. 2, S.131-138 |
| Datensatznummer |
250006695
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| Publikation (Nr.) |
 copernicus.org/npg-9-131-2002.pdf |
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| Zusammenfassung |
| Magnetic
reconnection is an important process providing a fast conversion of
magnetic energy into thermal and kinetic plasma energy. In this concern, a
key problem is that of the resistive diffusion region where the
reconnection process is initiated. In this paper, the diffusion region is
associated with a nonuniform conductivity localized to a small region. The
nonsteady resistive incompressible MHD equations are solved numerically
for the case of symmetric reconnection of antiparallel magnetic fields. A
Petschek type steady-state solution is obtained as a result of time
relaxation of the reconnection layer structure from an arbitrary initial
stage. The structure of the diffusion region is studied for various ratios
of maximum and minimum values of the plasma resistivity. The effective
length of the diffusion region and the reconnection rate are determined as
functions of the length scale and the maximum of the resistivity. For
sufficiently small length scale of the resistivity, the reconnection rate
is shown to be consistent with Petschek's formula. By increasing the
resistivity length scale and decreasing the resistivity maximum, the
reconnection layer tends to be wider, and correspondingly, the
reconnection rate tends to be more consistent with that of the
Parker-Sweet regime. |
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