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Statistical survey on the magnetic field in magnetotail current sheets： Cluster observations

ISSN号：0254-6124
期刊名称：《空间科学学报》
时间：0
分类：O212.2[理学—概率论与数理统计;理学—数学] O441.4[理学—电磁学;理学—物理]
作者机构：[1]Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China, [2]State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China, [3]College of Earth Science, Graduate University of Chinese Academy of Sciences, Beijing 100049, China, [4]Imperial College, London SW7 2AZ, United Kingdom
相关基金：The authors are grateful to Cluster FGM team, the Hungarian Data Centre and the ACE Science Center for providing us with four satellite magnetic measurement data, Cluster position data, and ACE level 2 data, respectively. This work was supported by the National Natural Science Foundation of China （40621003 and 40674094）, the National Basic Research Program of China （2006CB806305）, the Hundred Talents Program of the Chinese Academy of Sciences, and the Specialized Research Fund for State Key Laboratories.

作者： RONG ZhaoJin[1,2,3], SHEN Chao[1], LUCEK E[3], BALOGH A[4], YAO Li[1,2]

关键词：统计调查, 磁场分布, 电流片, 集群, 磁尾, 国际货币基金组织, 概率分布, 倾斜角度, magnetosphere, magnetic field, magnetotail current sheet, neutral sheet, dawn-dusk asymmetry

中文摘要：

穿 magnetotail 水流表的磁场的分发性质从 6 月与簇使命的磁性的测量数据统计上被探索了到年的 11 月 20012005。平均，它被发现那穿当前的表的磁场和它的 B z 部件的力量在离午夜靠近却在 dawnside 和 duskside 胁腹附近更强壮的区域是更弱的，一般来说，它暗示那一张更薄的当前的表在两胁腹附近发生在午夜和更厚的附近。尾巴水流表 flapping 的出现比在午夜区域在两胁腹上是更高的，尽管它在黎明胁腹是很经常的。有一个否定 B z 部件或一个强壮的 B y 部件的当前的表有发生在 21:0001:00 的磁性的本地时间的更高的可能性，显示那项磁性的活动，例如磁性的连接和当前的混乱更经常发生在那里。统计上， y 部件和磁场的 tilt 角度在当前的表衬里的 B 的概率分布是近似正常的分布，和弄平的当前的表的出现概率是大约三分之一正常水流的表。穿当前的表的磁场和 B z 部件主要从 1 nT 变化到 10 nT。在中央当前的表是的尾巴的 B y 部件平均两次在 1 AU 的 IMF B y。

英文摘要：

The distribution properties of the magnetic field in magnetotail current sheets have been explored statistically with the magnetic measurement data of the Cluster mission from June to November of the years 2001 2005. It is found that, on average, the strength of the magnetic field and its Bz component in the current sheet are weaker in the region close to midnight but stronger near the dawnside and duskside flanks, which implies that, in general, a thinner current sheet occurs near midnight and thicker ones near both flanks. The occurrence of tail current sheet flapping is higher on both flanks than in the midnight region, although it is most frequent in the dawn flank. Current sheets with a negative Bz component or a strong By component have a higher probability of occurring at magnetic local times of 21：00M）1：00, indicating that magnetic activity, e.g. magnetic reconnection and current disruption occur more frequently there. Statistically, the probability distributions of the By component and the tilt angle of magnetic field lines in the current sheet are approximately normal distributions, and the occurrence probability of the flattened current sheet is about one third that of the normal current sheet. The magnetic field and Bz component in the current sheet mainly vary from 1 nT to 10 nT. The By component in the tail central current sheet is on average twice the IMF By at 1 AU.

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