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| Titel |
Magnetic helicity of a flux rope in the magnetotail: THEMIS results |
| VerfasserIn |
Y. C. Zhang, C. Shen, Z. X. Liu, Y. Narita |
| 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 ; 28, no. 9 ; Nr. 28, no. 9 (2010-09-20), S.1687-1693 |
| Datensatznummer |
250016881
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| Publikation (Nr.) |
 copernicus.org/angeo-28-1687-2010.pdf |
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| Zusammenfassung |
| The magnetic field in many regions of magnetosphere has a complex topological
structure. As a parameter to measure the topological complexity, the concept
of magnetic helicity is a useful tool in magnetospheric physics. Here we
present a case study of magnetic helicity in the flux rope (FR) in the
near-Earth plasma sheet (PS) based on the in-situ observation from THEMIS for
the first time. With the help of the Grad-Shafranov reconstruction technique,
we determine the spatial distribution of magnetic field and evaluate the
magnetic helicity in the flux rope. The conservation of magnetic helicity
during multiple X-line reconnections and the transport of magnetic helicity
between different magnetic field configurations are also discussed. The
further application of helicity in magnetosphere will provide us more
knowledge about the topologic property of the magnetic fields there and more
attention should be paid to that. |
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