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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Far tail (255 R_E) fast response to very weak magnetic activity
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Far tail (255 R_E) fast response to very weak magnetic activity

机译：远的尾巴(255 R_E)快速反应很弱磁场活动

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摘要

We present an original study of the dynamical changes measured in the far tail at X_(GSM) ≈255 R_E, onboard STEREO-B, related to very weak substorm activity (AE < 100 nT). Three weak auroral electrojet perturbations are well correlated with motions of the far tail in which the spacecraft passes from the lobe to the boundary layer or to the magnetosheath. These boundary motions can hardly be related to a plasmoid as a widening of the tail is expected from such a high-pressure structure. Furthermore, for one of the AE enhancements, ground measurement of auroral luminosity and ground magnetic field provided a precise timing of the substorm onset, thus allowing estimation of the propagation speed of the tail disturbance, supposing it is initiated at ~20 R_E in the midtail. The computed velocity, 1800 km/s, much greater than the typical plasmoid propagation speed, implies that the tail disturbance is due to a large-scale wave propagating inside the lobe, initiated inside the inner plasma sheet at substorm onset and linked to current disruption and/or magnetic reconnection.
机译：我们提出一个原始的研究动态间的变化测量在遥远的尾巴(GSM)≈255R_E、机载STEREO-B相关很弱亚暴活动(AE < 100元)。极光电喷流扰动是好与运动相关的尾巴的宇宙飞船从叶边界层或磁鞘。边界相关的动作很难等离子粒团的扩大尾料从这样的高压结构。AE的增强,地面极光光度测量和地面磁场提供了一个精确的时间亚暴爆发,从而允许的估计传播速度的尾巴扰动,假设它是在~ 20 R_E发起midtail。比典型的等离子粒团传播速度,意味着尾干扰一个大规模的内波传播叶,发起内部等离子体内部表亚暴发病,与当前的混乱和/或磁重联。

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