Reconstruction of morningside plasma sheet compressional ULF Pc5 wave

Reconstruction of morningside plasma sheet compressional ULF Pc5 wave
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晨侧血浆片压缩 ULF Pc5 波的重建

DOI:
10.1007/s11431-011-4735-z
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发表时间:
2012-02
期刊:
Science China Technological Sciences
影响因子:
--
通讯作者:
Shi QuanQi
Shi QuanQi
中科院分区:
其他
文献类型:
--
作者:
Tian AnMin;Zong QiuGang;Shi QuanQi

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利用Grad-Shafranov(GS)重建方法,首次研究了1998年3月9日在磁赤道晨侧观测到的Pc 5频段的纵波事件。为了测试GS方法在Pc 5压缩波上应用的有效性,我们首先通过将其应用于一维电流片模型来对我们的过程进行基准测试。排除左手角,平均误差幅度小于10%。实际资料的重建表明,首次获得了不受模型约束的二维纵波成像图。磁力线密度呈周期性变化,波长约为地球半径的2-4倍。重建的磁拓扑结构的形状非常类似于以前的工作者提出的经验二维驻波模型。此外,我们还定量地恢复了波的等离子体热压力和电流密度。
We studied the compressional wave event in Pc5 frequency range observed in the dawn-side magnetic equator on 9 March 1998 by Grad-Shafranov(GS) reconstruction method for the first time. To test the effectiveness of application of GS method on Pc5 compressional wave, we benchmarked our procedure by applying it to a one-dimensional current sheet model first. Excluding the left-hand corners, the average error magnitude was less than 10%. The reconstruction of actual data showed that we obtained the 2-D map of compressional wave without suffering model constraints for the first time. The magnetic filed lines density cyclical changed, and the wavelength was about 2–4 times earth radius. The reconstructed magnetic topology had a shape very similar to the empirical 2-dimensional standing wave model proposed by the former workers. Besides, we also recovered the plasma thermal pressure and current density of the wave quantitatively.
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