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The force-free configuration of flux ropes in geomagnetotail: Cluster observations
Yang, Y. Y.; Shen, C.; Zhang, Y. C.; Rong, Z. J.; Li, X.; Dunlop, M.; Ma, Y. H.; Liu, Z. X.; Carr, C. M.; Reme, H.; Shen, C (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2014
Volume119Issue:8
ISSN2169-9380
Language英语
AbstractUnambiguous knowledge of magnetic field structure and the electric current distribution is critical for understanding the origin, evolution, and related dynamic properties of magnetic flux ropes (MFRs). In this paper, a survey of 13 MFRs in the Earth's magnetotail are conducted by Cluster multipoint analysis, so that their force-free feature, i.e., the kind of magnetic field structure satisfying J x B = 0, can be probed directly. It is showed that the selected flux ropes with the bipolar signature of the south-north magnetic field component generally lie near the equatorial plane, as expected, and that the magnetic field gradient is rather weak near the axis center, where the curvature radius is large. The current density (up to several tens of nA/m(2)) reaches their maximum values as the center is approached. It is found that the stronger the current density, the smaller the angles between the magnetic field and current in MFRs. The direct observations show that only quasi force-free structure is observed, and it tends to appear in the low plasma beta regime (in agreement with the theoretic results). The quasi force-free region is generally found to be embedded in the central portion of the MFRs, where the current is approximately field aligned and proportional to the strength of core field. It is shown that similar to 60% of surveyed MFRs can be globally approximated as force free. The force-free factor a is found to be nonconstantly varied through the quasi force-free MFR, suggesting that the force-free structure is nonlinear.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/4495
Collection空间科学部
Corresponding AuthorShen, C (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Yang, Y. Y.,Shen, C.,Zhang, Y. C.,et al. The force-free configuration of flux ropes in geomagnetotail: Cluster observations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2014,119(8).
APA Yang, Y. Y..,Shen, C..,Zhang, Y. C..,Rong, Z. J..,Li, X..,...&Shen, C .(2014).The force-free configuration of flux ropes in geomagnetotail: Cluster observations.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,119(8).
MLA Yang, Y. Y.,et al."The force-free configuration of flux ropes in geomagnetotail: Cluster observations".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 119.8(2014).
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