Cluster and TC-1 observation of magnetic holes in the plasma sheet

doi:10.5194/angeo-30-583-2012

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	Cluster and TC-1 observation of magnetic holes in the plasma sheet
	Sun, W. J. ; Shi, Q. Q. ; Fu, S. Y. ; Pu, Z. Y. ; Dunlop, M. W. ; Walsh, A. P. ; Zong, Q. G. ; Xiao, T. ; Tang, C. L. ; Reme, H. ; Carr, C. ; Lucek, E. ; Fazakerley, A.
刊名	annales geophysicae
	2012
关键词	Magnetospheric physics MHD waves and instabilities Plasma sheet DRIFT MIRROR INSTABILITY SOLAR-WIND LINEAR INSTABILITY HYBRID SIMULATIONS FIELD MEASUREMENTS MODE STRUCTURES ION-CYCLOTRON BOW SHOCK MAGNETOSHEATH MAGNETOSPHERE
DOI	10.5194/angeo-30-583-2012
英文摘要	Magnetic holes with relatively small scale sizes, detected by Cluster and TC-1 in the magnetotail plasma sheet, are studied in this paper. It is found that these magnetic holes are spatial structures and they are not magnetic depressions generated by the flapping movement of the magnetotail current sheet. Most of the magnetic holes (93%) were observed during intervals with B-z larger than B-x, i.e. they are more likely to occur in a dipolarized magnetic field topology. Our results also suggest that the occurrence of these magnetic holes might have a close relationship with the dipolarization process. The magnetic holes typically have a scale size comparable to the local proton Larmor radius and are accompanied by an electron energy flux enhancement at a 90A degrees pitch angle, which is quite different from the previously observed isotropic electron distributions inside magnetic holes in the plasma sheet. It is also shown that most of the magnetic holes occur in marginally mirror-stable environments. Whether the plasma sheet magnetic holes are generated by the mirror instability related to ions or not, however, is unknown. Comparison of ratios, scale sizes and propagation direction of magnetic holes detected by Cluster and TC-1, suggests that magnetic holes observed in the vicinity of the TC-1 orbit (similar to 7-12 R-E) are likely to be further developed than those observed by Cluster (similar to 7-18 R-E).; Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences; SCI(E); 9; ARTICLE; 3; 583-595; 30
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/393946]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Sun, W. J.,Shi, Q. Q.,Fu, S. Y.,et al. Cluster and TC-1 observation of magnetic holes in the plasma sheet[J]. annales geophysicae,2012.
APA	Sun, W. J..,Shi, Q. Q..,Fu, S. Y..,Pu, Z. Y..,Dunlop, M. W..,...&Fazakerley, A..(2012).Cluster and TC-1 observation of magnetic holes in the plasma sheet.annales geophysicae.
MLA	Sun, W. J.,et al."Cluster and TC-1 observation of magnetic holes in the plasma sheet".annales geophysicae (2012).