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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Pi2 pulsations associated with poleward boundary intensifications during the absence of substorms
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Pi2 pulsations associated with poleward boundary intensifications during the absence of substorms

机译：Pi2脉动与向南极的边界在没有亚暴的强化

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摘要

Pi2 pulsations during the intervals of extremely quiet geomagnetic conditions (Kp = 0) have been reported by Sutcliffe and Lyons [2002] . These authors observed that several Pi2 bursts occurred simultaneously at high (magnetic latitude = 71°) and low (42°) latitudes during the absence of magnetospheric substorms and found that the bursts are strongly correlated with poleward boundary intensifications (PBIs). The authors discussed the correlation between the PBI-associated Pi2 (PBI-Pi2) bursts and enhancements of energetic particle fluxes in the plasma sheet, but they did not focus on the wave properties of the PBI-Pi2 pulsations. In this study we examine whether the PBI-Pi2 pulsations at middle/low latitudes exhibit spatial variations similar to substorm-associated Pi2 pulsations. Using ground-based data from latitudinally and longitudinally extended magnetometer network and spacecraft data in the duskside, we investigate the spatial variation of the frequency, amplitude, phase, and interstation coherence of the PBI-Pi2 events. We show that the PBI-Pi2 pulsations in this study have different features at different local times and suggest that their period and duration are determined at a source region, where fast earthward flows brake.
机译：皮极脉冲的间隔期间安静的地磁条件(Kp = 0)报道通过拍摄和里昂[2002]。作者观察到,几个皮破裂发生同时在高(磁纬度= 71°)和低(42°)纬度在缺席的情况下磁层亚暴和发现破裂与向极强烈相关边界强化(PBIs)。讨论之间的相关性PBI-associated₂(PBI-Pi2)爆发增强的高能粒子通量等离子体,但是他们没有关注波PBI-Pi2脉动的属性。研究我们是否PBI-Pi2脉动在中间/低纬度地区展览空间变化类似于substorm-associated Pi2脉动。纬向和纵向扩展磁强计网络和航天器的数据duskside,我们调查的空间变化的频率、振幅、相位、电台间的相干的PBI-Pi2事件。PBI-Pi2脉动在这项研究中有不同的特性,在不同的本地时间和建议确定他们的时间和持续时间源区,快速向地面的流动刹车。

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