Cluster and TC-1 observation of magnetic holes in the plasma sheet
文献类型：期刊论文
| 作者 | 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. |
| 刊名 | ANNALES GEOPHYSICAE
 |
| 出版日期 | 2012 |
| 卷号 | 30期号:3页码:583-595 |
| 关键词 | Magnetospheric physics MHD waves and instabilities Plasma sheet |
| ISSN号 | 0992-7689 |
| 通讯作者 | Shi, QQ (reprint author), Shandong Univ Weihai, Sch Space Sci & Phys, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai, Peoples R China. |
| 中文摘要 | 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). |
| 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). |
| 学科主题 | 空间物理 |
| 收录类别 | SCI ; EI |
| 资助信息 | NNSFC [41031065, 41074106, 40874086]; Shandong Natural Science Foundation [2009ZRB01352, JQ201112]; IIFSDU [2010ZRJQ001]; Specialized Research Fund for State Key Laboratories in China; Chinese Academy of Sciences (CAS) [2009S1-54] |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3151]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 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,2012,30(3):583-595. |
| 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,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. |
入库方式： OAI收割
来源：国家空间科学中心
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