2001年9月15日Cluster卫星对电流片的观测研究
Current Sheet Structure and Motion Observed by Cluster on September 15, 2001
查看参考文献16篇
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文摘
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2001年9月15日0430—0515UT期间，Cluster卫星多次穿越磁尾电流片。由FGM、CIS等仪器获得了电流片磁场，粒子速度等数据变化情况，并得到了磁尾高速流的两次明显反转．本文采用GSM坐标系．利用求磁场空间梯度张量的方法获得了越尾电流，其电流密度的峰值为28nA／m^2．并对电流片在垂直方向上的摆动和在晨昏方向的波动现象进行了分析．数据显示此时电流片为薄电流片并有一个变薄的趋势，其厚度大约为0．20-3Re。磁场重联时地向流与尾向流均超过了1000km／s，并测得了电流片的法线方向和运动速度，从而得到了磁尾电流片的结构和运动情况。 |
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其他语种文摘
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Multiple crossings of the neutral sheet were observed by the Fltax Gate Magnetometer （FGM） and the Cluster Ion Spectrometry experiment （CIS） onboard the Cluster li at （-19, 4,-1） Re from 0430 UT to 0515 UT on September 15, 2001. The high-speed proton flow, which reversed from tailward to Earthward, was detected during the multi-crossings. Using a linear gradient/curl estimator technique the cross-tail current was obtained. The peak of the current density reached 28 nA/m^2. A large-scale wave propagating duskward and the thin current sheet flapping in the vertical direction were investigated, the thickness of the current sheet ranged from 0.3 Re to 0.2 Re, and had a tendency of being thinner. The velocity of the proton bulk flow in the x direction exceeded 1000 km/s during the magnetic field reconnection. By using the multi-point timing analysis and Minimum Variance Analysis, the structure and motion of the magnetotail current sheet were estimated. |
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来源
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空间科学学报
,2006,26(1):21-27 【核心库】
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关键词
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电流片
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Cluster
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磁场重联
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电流片摆动
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地址
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1.
中国科学技术大学地球与空间科学学院, 合肥, 230026
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中国科学院空间科学与应用研究中心
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Imperial College of Science, United Kingdom, London
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Centre d＇Etude Spatiale des Rayonnements, France, Toulouse
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0254-6124 |
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学科
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地球物理学 |
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基金
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国家自然科学基金项目
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文献收藏号
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CSCD:2238893
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参考文献 共
16
共1页
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