Cluster observations on the thin current sheet in the magnetotail

Cluster observations on the thin current sheet in the magnetotail
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对磁尾中薄电流片的集群观测

DOI:
10.5194/angeo-26-929-2008
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发表时间:
2008-05
影响因子:
1.9
通讯作者:
--
中科院分区:
地球科学3区
文献类型:
--
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分析了2001年9月15日的一次磁尾事件,在此期间星团飞船观测到薄电流片的嵌入和分岔。结果表明,离子的各向异性和非各向异性是导致这些新的平衡特征偏离传统Harris模型的原因。测量表明,嵌入的质子TCS表现出p || > p⊥的压力各向异性,同时与密度嵌入相关;而分叉氧离子TCS则表现出压力各向异性,主要是p || p⊥和非各向异性,除了在边缘p || > p⊥是必要的边缘firehose稳定性条件。观测了TCS的局部扑动,揭示了其孤波特性和垂直于日地方向平面上的扭结运动等特征。本研究揭示了磁尾电流片平衡的复杂性,并阐明了离子动力学在tcs动力学中所起的关键作用。
A magnetotail event on 15 September 2001 is analyzed, during which the Cluster spacecraft observed both embedding and bifurcation of the Thin Current Sheet (TCS). It is indicated that the ion anisotropy and nongyrotropy are responsible for those new equilibrium features that represent deviations from the conventional Harris model. Measurements show that an embedded proton TCS manifests a pressure anisotropy with p || > p ⊥ , simultaneously associated with a density embedding; while a bifurcated oxygen ion TCS exhibits a pressure anisotropy mainly with p || p ⊥ and nongrotropy, except at the edges where p || > p ⊥ is the necessary marginal firehose stability condition. The local flapping motion of the TCS was observed, and some particular features such as the solitary wave-like behavior and the kink motion in the plane perpendicular to the Sun-Earth direction were revealed. The present investigation intimates the complexity of equilibria of the magnetotail current sheet and declares the crucial role played by the ion kinetics in the dynamics of TCSs.
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