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题名: New method for determining central axial orientation of flux rope embedded within current sheet using multipoint measurements
作者: Li, ZhaoYu; Chen, Tao; Yan, GuangQing
作者部门: 空间科学部
通讯作者: Li, ZhaoYu (zyli@spaceweather.ac.cn)
刊名: Science China Earth Sciences
ISSN号: 1674-7313
出版日期: 2016
卷号: 59, 期号:10, 页码:2037-2052
收录类别: EI
英文摘要: A new method for determining the central axial orientation of a two-dimensional coherent magnetic flux rope (MFR) via multipoint analysis of the magnetic-field structure is developed. The method is devised under the following geometrical assumptions: (1) on its cross section, the structure is left-right symmetric; (2) the projected structure velocity is vertical to the line of symmetry. The two conditions can be naturally satisfied for cylindrical MFRs and are expected to be satisfied for MFRs that are flattened within current sheets. The model test demonstrates that, for determining the axial orientation of such structures, the new method is more efficient and reliable than traditional techniques such as minimum-variance analysis of the magnetic field, Grad-Shafranov (GS) reconstruction, and the more recent method based on the cylindrically symmetric assumption. A total of five flux transfer events observed by Cluster are studied using the proposed approach, and the application results indicate that the observed structures, regardless of their actual physical properties, fit the assumed geometrical model well. For these events, the inferred axial orientations are all in excellent agreement with those obtained using the multi-GS reconstruction technique. © 2016, Science China Press and Springer-Verlag Berlin Heidelberg.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5599
Appears in Collections:空间科学部_期刊论文

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