What is Cluster telling us about magnetotail dynamics?

被引：2

作者：

Baumjohann, W ^{[1
]}

Nakamura, R ^{[1
]}

机构：

[1] Austrian Acad Sci, Inst Weltraumforsch, A-8042 Graz, Austria

来源：

SOLAR WIND-MAGNETOSPHERE-IONOSPHERE DYNAMICS AND RADIATION MODELS | 2005年 / 36卷 / 10期

关键词：

Cluster; magnetotail dynamics; magnetosphere; current sheet;

D O I：

10.1016/j.asr.2004.02.021

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

In this review, we report on some new aspects of magnetotail dynamics found in the data of the first traversal of the magnetotail by the Cluster quartet in summer and autumn 2001: (1) The electron drift instrument made the first direct measurements of tail lobe convection. The statistical data shows convection toward the center of the plasma sheet, with a clear dependence on the sign of the interplanetary magnetic field B-Z component. Moreover, a dawn-dusk shear (if one compares convection in opposite lobes) for B-Y-dominated interplanetary field hints to an interconnection of open lobe field lines with the interplanetary medium. (2) At times the tail Current sheet resembles it one-dimensional Harris sheet, which might get its thin its 500 km and may carry current densities as high as 20-40 nA/m(2). (3) At other times, the current sheet may exhibit rapid kink-type flapping motion with vertical velocities of 50-100 km/s. During these intervals the current sheet clearly exhibits a bifurcated structure, with two current density maxima around a region of much reduced current in the center of the plasma sheet. (c) 2005 COSPAR. Published by Elsevier Ltd. All rights reserved.

引用

页码：1909 / 1915

页数：7

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