中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Magnetospheric Multiscale Observations of Electron Vortex Magnetic Hole in the Turbulent Magnetosheath Plasma

文献类型:期刊论文

作者Huang, S. Y.1,2; Sahraoui, F.2; Yuan, Z. G.1; He, J. S.3; Zhao, J. S.4; Le Contel, O.2; Deng, X. H.5; Zhou, M.6; Fu, H. S.7; Shi, Q. Q.8
刊名ASTROPHYSICAL JOURNAL LETTERS
出版日期2017-02-20
卷号836期号:2页码:8
ISSN号2041-8205
关键词Earth planets and satellites: magnetic fields planets and satellites: terrestrial planets plasmas turbulence
DOI10.3847/2041-8213/aa5f50
英文摘要

We report on the observations of an electron vortex magnetic hole corresponding to a new type of coherent structure in the turbulent magnetosheath plasma using the Magnetospheric Multiscale mission data. The magnetic hole is characterized by a magnetic depression, a density peak, a total electron temperature increase (with a parallel temperature decrease but a perpendicular temperature increase), and strong currents carried by the electrons. The current has a dip in the core region and a peak in the outer region of the magnetic hole. The estimated size of the magnetic hole is about 0.23 rho(i) (similar to 30 rho(e)) in the quasi-circular cross-section perpendicular to its axis, where rho(i) and rho(e) are respectively the proton and electron gyroradius. There are no clear enhancements seen in high-energy electron fluxes. However, there is an enhancement in the perpendicular electron fluxes at 90 degrees pitch angle inside the magnetic hole, implying that the electrons are trapped within it. The variations of the electron velocity components V-em and V-en suggest that an electron vortex is formed by trapping electrons inside the magnetic hole in the cross-section in the M-N plane. These observations demonstrate the existence of a new type of coherent structures behaving as an electron vortex magnetic hole in turbulent space plasmas as predicted by recent kinetic simulations.

WOS关键词SOLAR-WIND ; ROTATIONAL DISCONTINUITIES ; EARTHS MAGNETOSHEATH ; CLUSTER OBSERVATIONS ; KINETIC SIMULATIONS ; DISSIPATION RANGE ; RECONNECTION ; FIELD ; DYNAMICS ; SPECTRA
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000396007700001
源URL[http://libir.pmo.ac.cn/handle/332002/23210]  
专题中国科学院紫金山天文台
通讯作者Huang, S. Y.
作者单位1.Wuhan Univ, Sch Elect Informat, Wuhan, Peoples R China
2.UPMC, CNRS, Ecole Polytech, Lab Phys Plasmas, Palaiseau, France
3.Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing, Peoples R China
5.Nanchang Univ, Inst Space Sci & Technol, Nanchang, Jiangxi, Peoples R China
6.Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA USA
7.Beihang Univ, Sch Space & Environm, Beijing, Peoples R China
8.Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai, Peoples R China
9.Univ Toulouse UPS, Inst Rech & Astrophys & Planetol, Toulouse, France
10.CNRS, UMR 5277, Toulouse, France
推荐引用方式
GB/T 7714
Huang, S. Y.,Sahraoui, F.,Yuan, Z. G.,et al. Magnetospheric Multiscale Observations of Electron Vortex Magnetic Hole in the Turbulent Magnetosheath Plasma[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,836(2):8.
APA Huang, S. Y..,Sahraoui, F..,Yuan, Z. G..,He, J. S..,Zhao, J. S..,...&Burch, J. L..(2017).Magnetospheric Multiscale Observations of Electron Vortex Magnetic Hole in the Turbulent Magnetosheath Plasma.ASTROPHYSICAL JOURNAL LETTERS,836(2),8.
MLA Huang, S. Y.,et al."Magnetospheric Multiscale Observations of Electron Vortex Magnetic Hole in the Turbulent Magnetosheath Plasma".ASTROPHYSICAL JOURNAL LETTERS 836.2(2017):8.

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来源:紫金山天文台

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