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Magnetospheric Multiscale Observations of Electron Vortex Magnetic Hole in the Turbulent Magnetosheath Plasma
Huang, S. Y.; Sahraoui, F.; Yuan, Z. G.; He, J. S.; Zhao, J. S.; Le Contel, O.; Deng, X. H.; Zhou, M.; Fu, H. S.; Shi, Q. Q.; Lavraud, B.; Pang, Y.; Yang, J.; Wang, D. D.; Li, H. M.; Yu, X. D.; Pollock, C. J.; Giles, B. L.; Torbert, R. B.; Russell, C. T.; Goodrich, K. A.; Gershman, D. J.; Moore, T. E.; Ergun, R. E.; Khotyaintsev, Y. V.; Lindqvist, P. -A.; Strangeway, R. J.; Magnes, W.; Bromund, K.; Leinweber, H.; Plaschke, F.; Anderson, B. J.; Burch, J. L.
2017
发表期刊ASTROPHYSICAL JOURNAL LETTERS
卷号836期号:2页码:L27-
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.
语种英语
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/17389
专题太阳和太阳系等离子体研究团组
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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):L27-.
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),L27-.
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):L27-.
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