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MAGNETOTAIL SUBSTORM FEATURES FROM MULTI-POINT OBSERVATIONS

机译：多点观测的磁悬浮特征

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摘要

We examine several dipolarizations and a reversal ofrnplasma flow detected by Cluster at the downstreamrndistance of ～19 RE in the midnight sector of thernmagnetotail on August 22, 2001. These substormrnfeatures occurred during a sequence of substorm activityrnseen by the IMAGE/FUV imager. Findings consistentrnwith previous reports are the following: (1) there isrngenerally a decrease of the z-component of the magneticrnfield (Bz) prior to dipolarization; (2) the onset ofrndipolarization can precede the onset of significantrnplasma flow; (3) dipolarization is quite episodic inrnnature, consisting of multiple increases and decreases ofrnthe Bz component. New features revealed in this studyrnare the following: (1) the turbulent region associatedrnwith dipolarization can exhibit dynamo effect as well asrndissipation, (2) the x-component of the Lorentz forcern(j×B)x does not change sign at plasma flow reversalrnalthough the other two components do (indicative ofrnchanges in the magnetic stress consistent with shiftingrndominance of multiple activity sites rather than arntailward movement of a single activity site as commonlyrnassumed), and (3) the frozen-in condition breaks downrnduring dipolarization in several regions where the Bzrncomponent and the total magnetic field strength havernlarge values, different from the expectation of therndiffusion region associated with magnetic reconnection.
机译：我们研究了2001年8月22日午夜磁链尾部〜19 RE的下游距离上的簇所检测到的几个双极化和逆转的浆体流。这些亚暴特征发生在IMAGE / FUV成像仪看到的一系列亚暴活动期间。与以前的报告相一致的发现如下：（1）在发生双极化之前，磁场的z分量（Bz）通常减小； （2）双极化的发作可以先于显着的血浆流的发作； （3）偶极极化是一种偶发性现象，由Bz分量的多次增减组成。这项研究揭示的新特征如下：（1）与双极化相关的湍流区域可以表现出发电机效应和消散作用；（2）洛伦兹力的x分量（j×B）x在血浆流逆转时不会改变符号其他两个成分也确实如此（指示磁性应力的变化与多个活动部位的主导移动而不是通常单个活动部位的向尾运动一致），并且（3）在Bzrn分量的几个区域中，在双极化期间冻结状态破坏了分解和总磁场强度具有较大的值，这与与磁重新连接相关的扩散区域的预期不同。

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  • 会议地点 Noordwijk(NL);Noordwijk(NL)
  • 作者

    A.T.Y. Lui; Y. Zheng; A. Balogh; P. W. Daly; M. W. Dunlop; T. A. Fritz; G. Gustafsson; rnS. Livi; S. B. Mende; C. J. Owen; R. F. Pfaff; H. Rème; Y. Zhang; Q. Zong;

  • 作者单位

    JHU/APL, 11100 Johns Hopkins Rd., Laurel, MD 20723-6099, USA;

    JHU/APL, 11100 Johns Hopkins Rd., Laurel, MD 20723-6099, USA;

    Imperial College, Department of Space and Atmospheric Physics, London, UK;

    Max-Planck-Institut für Aeronomie, D-37191 Katlenburg-Lindau, Germany;

    Space Science and Technology Department, RAL, Chilton, Didcot, Oxfordshire OX11 0QX, UK;

    Center for Space Physics, Boston University, 725 Commonwealth Ave., Boston, MA 02215, USA;

    Swedish Institute of Space Physics, Uppsala Division, S-755 91 Uppsala, Sweden;

    JHU/APL, 11100 Johns Hopkins Rd., Laurel, MD 20723-6099, USA;

    University of California, Space Sciences Laboratory, 7 Gauss Way, Berkeley, CA 94720-7450, USA;

    Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK;

    Laboratory f;

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