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Observations of kinetic-size magnetic holes in the magnetosheath
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
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2017
卷号122期号:2页码:1990-2000
ISSN2169-9380
语种英语
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).
收录类别SCI
文献类型期刊论文
条目标识符http://ir.nssc.ac.cn/handle/122/5817
专题空间科学部
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GB/T 7714
Yao, S. T.,Wang, X. G.,Shi, Q. Q.,et al. Observations of kinetic-size magnetic holes in the magnetosheath[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2017,122(2):1990-2000.
APA Yao, S. T..,Wang, X. G..,Shi, Q. Q..,Pitkanen, T..,Hamrin, M..,...&Liu, J..(2017).Observations of kinetic-size magnetic holes in the magnetosheath.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,122(2),1990-2000.
MLA Yao, S. T.,et al."Observations of kinetic-size magnetic holes in the magnetosheath".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 122.2(2017):1990-2000.
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