globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA024971
Scopus记录号: 2-s2.0-85046246142
论文题名:
Understanding the Twist Distribution Inside Magnetic Flux Ropes by Anatomizing an Interplanetary Magnetic Cloud
作者: Wang Y.; Shen C.; Liu R.; Liu J.; Guo J.; Li X.; Xu M.; Hu Q.; Zhang T.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:5
起始页码: 3238
结束页码: 3261
语种: 英语
英文关键词: coronal mass ejections ; instabilities ; magnetic clouds ; magnetic flux ropes ; twist
英文摘要: Magnetic flux rope (MFR) is the core structure of the greatest eruptions, that is, the coronal mass ejections (CMEs), on the Sun, and magnetic clouds are posteruption MFRs in interplanetary space. There is a strong debate about whether or not a MFR exists prior to a CME and how the MFR forms/grows through magnetic reconnection during the eruption. Here we report a rare event, in which a magnetic cloud was observed sequentially by four spacecraft near Mercury, Venus, Earth, and Mars, respectively. With the aids of a uniform-twist flux rope model and a newly developed method that can recover a shock-compressed structure, we find that the axial magnetic flux and helicity of the magnetic cloud decreased when it propagated outward but the twist increased. Our analysis suggests that the “pancaking” effect and “erosion” effect may jointly cause such variations. The significance of the pancaking effect is difficult to be estimated, but the signature of the erosion can be found as the imbalance of the azimuthal flux of the cloud. The latter implies that the magnetic cloud was eroded significantly leaving its inner core exposed to the solar wind at far distance. The increase of the twist together with the presence of the erosion effect suggests that the posteruption MFR may have a high-twist core enveloped by a less-twisted outer shell. These results pose a great challenge to the current understanding on the solar eruptions as well as the formation and instability of MFRs. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113986
Appears in Collections:气候减缓与适应

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作者单位: CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, China; Collaborative Innovation Center of Astronautical Science and Technology, Hefei, China; Solar Physics and Space Plasma Research Center, School of Mathematics and Statistics, University of Sheffield, Sheffield, United Kingdom; Institute of Experimental and Applied Physics, University of Kiel, Kiel, Germany; Department of Space Science and CSPAR, The University of Alabama in Huntsville, Huntsville, AL, United States; Space Research Institute, Austrian Academy of Sciences, Graz, Austria

Recommended Citation:
Wang Y.,Shen C.,Liu R.,et al. Understanding the Twist Distribution Inside Magnetic Flux Ropes by Anatomizing an Interplanetary Magnetic Cloud[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)
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