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| Titel |
Evolution of magnetic helicity under kinetic magnetic reconnection: Part II B ≠ 0 reconnection |
| VerfasserIn |
T. Wiegelmann, J. Büchner |
| 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.139-147 |
| Datensatznummer |
250006696
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| Publikation (Nr.) |
 copernicus.org/npg-9-139-2002.pdf |
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| Zusammenfassung |
| We investigate the
evolution of magnetic helicity under kinetic
magnetic reconnection in thin current sheets. We use Harris sheet
equilibria and superimpose an external magnetic guide field. Consequently,
the classical 2D magnetic neutral line becomes a field line here, causing
a B ≠ 0
reconnection. While without a guide field, the Hall effect leads to a
quadrupolar structure in the perpendicular magnetic field and the helicity
density, this effect vanishes in the B ≠
0 reconnection. The reason is that electrons are magnetized in the guide
field and the Hall current does not occur. While a B = 0 reconnection
leads just to a bending of the field lines in the reconnection area, thus
conserving the helicity, the initial helicity is reduced for a B ≠
0 reconnection. The helicity reduction is, however, slower than the
magnetic field dissipation. The simulations have been carried out by the
numerical integration of the Vlasov-equation. |
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