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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Comment on 'formation of substorm Pi2: A coherent response to auroral streamers and currents' by Y. Nishimura et al.
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Comment on 'formation of substorm Pi2: A coherent response to auroral streamers and currents' by Y. Nishimura et al.

机译：评论“亚暴皮的形成:一个连贯的极光飘带和电流”,Y。西村等人。

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摘要

[1] In their recent paper, Nishimura et al. [2012], hereafter termed N12, conclude that Pi2 magnetic field pulsations and auroral brightenings in the substorm expansion phase are driven coherently by flow bursts in the magnetotail. The authors claim not only that the flow bursts, auroral brightenings, and magnetic field perturbations all have periodicities in the Pi2 range but significantly also that the individual perturbations are all coherent and, as a consequence, infer a causal and one-to-one connection between them. In their scenario, fast earthward flows in the plasma sheet with fine structure in the Pi2 frequency range are responsible, in a piecewise and coherent fashion, for establishing one-by-one additional elements of the substorm current wedge (SCW) in response to each element of the flow burst fine structure. In other words, each subsequent flow burst adds an additional current element to the SCW, coherently driving both repeated enhancements in the aurora and step-like changes in the ground magnetic field across a wide longitudinal range such that “each Pi2 pulse starts to rise simultaneously over a wide range of latitude from the auroral zone to the magnetic dip equator as well as over a wide longitudinal range” [N12, abstract]. Each of these occurs at intervals separated by tens of seconds or minutes corresponding to the tail flow variations in the Pi2 band. The N12 claims are in stark contrast to the traditional explanation inferred from groundbased magnetic ULF wave observations that invokes bouncing Alfvén waves for the periodic structure of the Pi2s, and which necessarily includes propagation effects and precludes such large-scale coherence, based in part on the known fact that in order to establish a field-aligned current, one needs to send Alfvén waves along the field line [see, for example, Olson, 1999, and references therein].
机译：[1]在他们最近的报告中,西村等。[2012],以下称为N12,得出结论:皮磁场脉动和极光明亮的亚暴扩张阶段流爆发前后一致地的驱动磁尾。流破裂,极光明亮和磁性场扰动都有周期的研究皮范围但也显著的个人扰动都是连贯的,因此,推断因果和一对一的他们之间的联系。向地面流等离子体与细表结构Pi2频率范围负责、分段和连贯的方式,建立一个额外的元素亚暴当前楔(标准铜线)的反应为每个元素流的精细结构。换句话说,每个后续流突然补充道一个额外的当前元素标准铜线,前后一致地重复增强驾驶极光在地上和梯状变化磁场在纵向范围宽这样“每个Pi2脉冲开始上升同时在一个广泛的纬度磁磁赤道的极光区在纵向范围宽以及“N12,抽象的)。相隔几十秒或几分钟对应于尾部流的变化皮乐队。传统的解释推断groundbased磁ULF波观测调用跳跃阿尔芬波周期结构的皮,一定包括传播效果和排除了大规模的连贯性,部分基于已知的为了建立一个field-aligned的事实当前,一个需要发送阿尔芬波沿场线(见,例如,奥尔森、1999和引用)。

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