Cluster Observations of a Dispersive Flapping Event of Magnetotail Current Sheet

doi:10.1029/2018JA025196

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院地球与行星物理重点实验室

	Cluster Observations of a Dispersive Flapping Event of Magnetotail Current Sheet
	Rong, Z. J.1,2,3; Cai, Y. H.1,2; Gao, J. W.1,2; Lui, A. T. Y.4; Shen, C.5; Petrukovich, A. A.6; Wei, Y.1,2,3; Wan, W. X.1,2,3
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2018-07-01
卷号	123 期号:7 页码:5571-5579
ISSN号	2169-9380
DOI	10.1029/2018JA025196
英文摘要	A kink-like flapping event of Earth magnetotail current sheet, which consists of two frequency bands successively, is studied by the multipoint observations of Cluster. The multipoint analysis of Cluster observations demonstrates that the higher frequency band (period is about 10 min) has faster propagation velocity (about 30 km/s), shorter wavelength (about 3 R-E), and smaller amplitude (1-1.5 R-E). In contrast, the lower frequency band (period is about 22 min) shows slower propagation velocity (about 21 km/s), longer wavelength (about 4.4 R-E), and larger amplitude (2-3 R-E). Comparison with the flapping models demonstrates that the dispersion of theoretical models does not show consistency with the results of this event, which suggests that new or more advanced kink-like flapping theories or models in the future have to consider the constraints of the dispersive properties demonstrated by this event. Plain Language Summary The morphology of the elongated geomagnetic field in the downstream, called as magnetotail, implies presence of a current sheet near equator where magnetic field reverses its direction. Earlier studies demonstrate that the local current sheet often moves or flaps up and down, resulting in multiple crossings of current sheet as observed by spacecraft. As an important dynamic process for releasing the magnetospheric energy, flapping motion has drawn attention increasingly. Observations in the past decade demonstrate that the flapping motion of magnetotail current sheet can propagate from midnight toward both flanks with velocities of a few tens of kilometers per second, but the physics of propagation remains unclear though some theories or models have been presented. Here with a fortunately selected flapping event, which comprises two frequency bands successively observed by Cluster tetrahedron, we showed for the first time that the propagation of flapping waves is dispersive that the flapping waves with higher frequency band have faster propagation velocity, shorter wavelength, smaller amplitude, and vice versa. The revealed dispersion properties are inconsistent with the current models. Thus, new or more advanced flapping theories or models are required in the future considering the constraints of the dispersive properties demonstrated by this study.
资助项目	National Natural Science Foundation of China[41621063] ; National Natural Science Foundation of China[41374180] ; National Natural Science Foundation of China[41774188] ; National Natural Science Foundation of China[41525016] ; National Natural Science Foundation of China[41321003] ; National Natural Science Foundation of China[41231066]
WOS关键词	TILTED CURRENT SHEETS ; ION KINK INSTABILITY ; NEUTRAL SHEET ; PLASMA SHEET ; GEOMAGNETIC TAIL ; MOTION ; OSCILLATIONS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000442664300022
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88121]
专题	地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者	Rong, Z. J.
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China 4.Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA 5.Harbin Inst Technol, Shenzhen, Peoples R China 6.Russian Acad Sci, Space Res Inst, Moscow, Russia
推荐引用方式 GB/T 7714	Rong, Z. J.,Cai, Y. H.,Gao, J. W.,et al. Cluster Observations of a Dispersive Flapping Event of Magnetotail Current Sheet[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2018,123(7):5571-5579.
APA	Rong, Z. J..,Cai, Y. H..,Gao, J. W..,Lui, A. T. Y..,Shen, C..,...&Wan, W. X..(2018).Cluster Observations of a Dispersive Flapping Event of Magnetotail Current Sheet.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,123(7),5571-5579.
MLA	Rong, Z. J.,et al."Cluster Observations of a Dispersive Flapping Event of Magnetotail Current Sheet".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 123.7(2018):5571-5579.