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题名: Observations of kinetic-size magnetic holes in the magnetosheath
作者: Yao, S. T.; Wang, X. G.; Shi, Q. Q.; Pitkanen, T.; Hamrin, M.; Yao, Z. H.; Li, Z. Y.; Ji, X. F.; De Spiegeleer, A.; Xiao, Y. C.; Tian, A. M.; Pu, Z. Y.; Zong, Q. G.; Xiao, C. J.; Fu, S. Y.; Zhang, H.; Russell, C. T.; Giles, B. L.; Guo, R. L.; Sun, W. J.; Li, W. Y.; Zhou, X. Z.; Huang, S. Y.; Vaverka, J.; Nowada, M.; Bai, S. C.; Wang, M. M.; Liu, J.
作者部门: 空间科学部
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN号: 2169-9380
出版日期: 2017
卷号: 122, 期号:2, 页码:1990-2000
收录类别: SCI
项目资助者: National Natural Science Foundation of China [41574157, 41322031, 41628402] ; European Union
英文摘要: Magnetic holes (MHs), with a scale much greater than pi ( proton gyroradius), have been widely reported in various regions of space plasmas. On the other hand, kinetic-size magnetic holes (KSMHs), previously called small-size magnetic holes, with a scale of the order of magnitude of or less than.i have only been reported in the Earth's magnetospheric plasma sheet. In this study, we report such KSMHs in the magnetosheath whereby we use measurements from the Magnetospheric Multiscale mission, which provides three-dimensional (3-D) particle distribution measurements with a resolution much higher than previous missions. The MHs have been observed in a scale of 10-20 pe ( electron gyroradii) and lasted 0.1-0.3 s. Distinctive electron dynamics features are observed, while no substantial deviations in ion data are seen. It is found that at the 90 degrees pitch angle, the flux of electrons with energy 34-66 eV decreased, while for electrons of energy 109-1024 eV increased inside the MHs. We also find the electron flow vortex perpendicular to the magnetic field, a feature self-consistent with the magnetic depression. Moreover, the calculated current density is mainly contributed by the electron diamagnetic drift, and the electron vortex flow is the diamagnetic drift flow. The electron magnetohydrodynamics soliton is considered as a possible generation mechanism for the KSMHs with the scale size of 10-20 rho(e).
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5817
Appears in Collections:空间科学部_期刊论文

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