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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.; Shi, QQ (reprint author), Shandong Univ Weihai, Sch Space Sci & Phys, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai, Peoples R China.
Department空间科学部
Source PublicationANNALES GEOPHYSICAE
2012
Volume30Issue:3Pages:583-595
ISSN0992-7689
Language英语
KeywordMagnetospheric Physics Mhd Waves And Instabilities Plasma Sheet
AbstractMagnetic 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).; 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).
Indexed BySCI ; EI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3151
Collection空间科学部
Corresponding AuthorShi, QQ (reprint author), Shandong Univ Weihai, Sch Space Sci & Phys, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai, Peoples R China.
Recommended Citation
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,2012,30(3):583-595.
APA Sun, W. J..,Shi, Q. Q..,Fu, S. Y..,Pu, Z. Y..,Dunlop, M. W..,...&Shi, QQ .(2012).Cluster and TC-1 observation of magnetic holes in the plasma sheet.ANNALES GEOPHYSICAE,30(3),583-595.
MLA Sun, W. J.,et al."Cluster and TC-1 observation of magnetic holes in the plasma sheet".ANNALES GEOPHYSICAE 30.3(2012):583-595.
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