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题名: Magnetospheric Multiscale Observations of Electron Scale Magnetic Peak
作者: Yao, S. T.; Shi, Q. Q.; Guo, R. L.; Yao, Z. H.; Tian, A. M.; Degeling, A. W.; Sun, W. J.; Liu, J.; Wang, X. G.; Zong, Q. G.; Zhang, H.; Pu, Z. Y.; Wang, L. H.; Fu, S. Y.; Xiao, C. J.; Russell, C. T.; Giles, B. L.; Feng, Y. Y.; Xiao, T.; Bai, S. C.; Shen, X. C.; Zhao, L. L.; Liu, H.
作者部门: 空间科学部
通讯作者: Shi, QQ (reprint author), Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai, Peoples R China. ; Guo, RL (reprint author), Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China.
关键词: electron size ; electron vortex ; magnetic bottle ; magnetic peak ; magnetic mirror ; flux rope
刊名: GEOPHYSICAL RESEARCH LETTERS
ISSN号: 0094-8276
出版日期: 2018
卷号: 45, 期号:2, 页码:527-537
收录类别: SCI
项目资助者: National Natural Science Foundation of China [41774153, 41574157, 41628402] ; young scholar plan of Shandong University at Weihai [2017WHWLJH08] ; European Union ; NSF [AGS-1352669]
英文摘要: The sudden enhancements of magnetic strength, named magnetic peaks (MPs), are often observed in the magnetosheath of magnetized planets. They are usually identified as flux ropes (FRs) or magnetic mirror mode structures. Previous studies of MPs are mostly on the magnetohydrodynamics (MHD) scale. In this study, an electron scale MP is reported in the Earth magnetosheath. We present a typical case with a scale of similar to 7 electron gyroradii and a duration of similar to 0.18 s. A strong magnetic disturbance and associated electrical current are detected. Electron vortex is found perpendicular to the magnetic field line and is self-consist with the peak. We use multipoint spacecraft techniques to determine the propagation velocity of the MP structure and find that the magnetic peak does propagate relative to the plasma (ion) flow. This is very different from the magnetic mirror mode that does not propagate relative to the plasma flow. Furthermore, we developed an efficient method that can effectively distinguish "magnetic bottle like" and "FRs like" structures. The MP presented in this study is identified as magnetic bottle like type. The mechanism to generate the electron scale magnetic bottle like structure is still unclear, suggesting that new theory needs to be developed to understand such small-scale phenomena.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6199
Appears in Collections:空间科学部_期刊论文

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