Fast moving plasma structures in the distant magnetotail
Fast moving plasma structures in the distant magnetotail
复制标题
遥远磁尾中快速移动的等离子体结构
DOI：
10.1029/ja089ia08p06717
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发表时间：
1984
影响因子：
--
通讯作者：
E. Smith
中科院分区：
文献类型：
--
作者：
M. Scholer;G. Gloeckler;B. Klecker;F. Ipavich;D. Hovestadt;E. Smith
本文首次报道了地球远磁尾约220 R/sub E/和约110 R/sub E/处高能质子和高能电子的强度和角分布的详细时间行为。这些数据是由马克斯-普朗克研究所/马里兰州大学的ISEE 3传感器系统在航天器首次深尾通过期间获得的。详细研究了三个高能粒子爆发。在这些爆发的开始，我们首先观察到能量为75- 115千电子伏的电子流。几分钟后，各向异性质子紧随其后。质子表现出能量分布，其中较高能量质子（约20 keV）出现在较低能量（约32 keV）质子之前。在这三种情况中的两种情况下，流动电子分布在8- 15分钟后由各向同性电子分布跟随。在爆发的后侧，时间色散效应没有以相反的顺序出现。此外，没有梯度各向异性的影响，观察到在质子流的开始。我们认为，卫星遇到分离的等离子体结构证明了各向同性的电子。这些结构，可能是等离子体团，以高速（约800公里/秒）的尾巴。高能电子和质子在这些快速向尾部移动的等离子体结构之前流动，这导致了各种时间色散效应。原则上，这允许确定源距卫星的距离。«少
We report in this paper for the first time the detailed time behavior of the intensities and the angular distributions of energetic protons and electrons in the distant magnetotail of the earth at approx.220 R/sub E/ and approx.110 R/sub E/. The data have been obtained by the Max-Planck-Institut/ University of Maryland sensor system on ISEE 3 during the spacecrft first deep tail passage. Three energetic particle bursts are studied in detail. At the beginning of these bursts we first observe streaming electrons at an energy of 75--115 keV. These are followed after several minutes by anisotropic protons. The protons exhibit an energy distribution with higher energy protons (approx.20 keV) appearing before lower energy (approx.32 keV) protons. In two of the three cases the streaming electron distributions are followed after 8--15 min by an isotropic electron distribution. At the rear side of the bursts the time dispersion effects are not seen in reverse order. Also, no gradient anisotropy effects are observed in the beginning of the proton streaming. We suggest that the satellite encounters detached plasma structures evidenced by the isotropic electrons. These structures, probably plasmoids, move with high velocities (approx.800 km/s) down the tail. The energetic electrons and protons streammore » ahead of these fast tailward moving plasma structures, which leads to the various time dispersion effects. This allows, in principle, a determination of the source distance from the satellite.« less