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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Oscillatory Flows in the Magnetotail Plasma Sheet:Cluster Observations of the Distribution Function
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Oscillatory Flows in the Magnetotail Plasma Sheet:Cluster Observations of the Distribution Function

机译：在磁尾等离子体振荡流表:集群分布的观测函数

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摘要

Plasma dynamics in Earth's magnetotail is often studied using moments of the distribution function, which results in losing information on the kinetic properties of the plasma. To better understand oscillatory flows observed in the midtail plasma sheet, we investigate two events, one in each hemisphere, in the transition region between the central plasma sheet and the lobes using the 2-D ion distribution function from the Cluster 4 spacecraft. In this case study, the oscillatory flows are a manifestation of repeated ion flux enhancements with pitch angle changing from 0° to 180° in the Northern Hemisphere and from 180° to 0° in the Southern Hemisphere. Similar pitch angle signatures are observed seven times in about 80 min for the Southern Hemisphere event and three times in about 80 min for the Northern Hemisphere event. The ion flux enhancements observed for both events are slightly shifted in time between different energy channels, indicating a possible time-of-flight effect from which we estimate that the source of particle is located ~ 5-25R_E and ~ 40-107R_E tailward of the spacecraft for the Southern and Northern Hemisphere event, respectively. Using a test particle simulation, we obtain ~21-46 R_E for the Southern Hemisphere event and tailward of X~ -65R_E (outside the validity region of the model) for the Northern Hemisphere event.We discuss possible sources that could cause the enhancements of ion flux.
机译：在地球磁尾等离子体动力学是经常的研究使用的分布函数,它导致失去信息等离子体的动力学特性。了解振荡流中观察到midtail等离子板,我们调查两个事件,一个在每一个半球,在过渡区中央等离子板和叶之间使用的二维离子分布函数集群4飞船。振荡流是重复的表现离子通量的增强与螺旋角发生变化从0°- 180°在北半球从180°为0°在南半球。有类似的螺旋角签名7在南半球的约80分钟事件和大约80分钟的三倍北半球的事件。增强观察事件略转移不同能源之间的时间渠道,表示一个可能的飞行时间影响我们估计的来源粒子位于~ 5-25R_E和~ 40 - 107 r_e南部和tailward航天器北半球事件,分别。测试粒子模拟,我们得到~ 21-46 R_E南半球的事件和tailwardX ~ -65 r_e(外区域的有效性为北半球事件模型)。讨论可能的来源,可能导致增强的离子通量。

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