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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Cluster observations of an ion-scale current sheet in the magnetotail under the presence of a guide field
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Cluster observations of an ion-scale current sheet in the magnetotail under the presence of a guide field

机译：集群的观察ion-scale当前表在磁尾的指南场

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摘要

We report on Cluster observations of a thin current sheet interval under the presence of a strong ∣B Y ∣ during a fast earthward flow interval between 1655 UT and 1703 UT on 17 August 2003. The strong ∣B Y ∣ in the tail could be associated with a strong IMF ∣B Y ∣, but the large fluctuations in B Y , not seen in the IMF, suggest that a varying reconnection rate causes a varying transport of B Y -dominated magnetic flux and/or a change in B Y due to the Hall-current system. During the encounter of the high-speed flow, an intense current layer was observed around 1655:53 UT with a peak current density of 182 nA/m2, the largest current density observed by the Cluster four-spacecraft magnetic field measurement in the magnetotail. The half width of this current layer was estimated to be ～290 km, which was comparable to the ion-inertia length. Its unique signature is that the strong current is mainly field-aligned current flowing close to the center of the plasma sheet. The event was associated with parallel heating of electrons with asymmetries, which suggests that electrons moving along the field lines can contribute to a strong dawn-to-dusk current when the magnetotail current sheet becomes sufficiently thin and active in a strong guide field case.
机译：我们报告集群的观察一个瘦电流片区间的存在强∣B Y∣在快速向地面的流间隔1655 UT、1703 UT 8月17日2003. 与一个强大的国际货币基金组织(IMF) Y∣∣B,但未见的大波动B Y,国际货币基金组织,表明不同的重联率引起不同运输的B Y主导磁通量和/或B Y由于霍尔电流的变化系统。流,一场激烈的观察当前层在1655:53 UT峰值电流密度182 nA / m2,最大电流密度通过集群四个航天器磁场测量在磁尾。当前层估计~ 290公里,这是与ion-inertia长度。其独特的签名是,强大的电流主要是field-aligned电流接近吗等离子体的中心。与并行相关电子的加热与不对称,这表明电子沿着电场线可以导致强大的黎明到黄昏当前磁尾当前表变得足够薄,活跃在一个强大的指导现场情况。

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