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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >The correlation of ULF waves and auroral intensity before, during and after substorm expansion phase onset
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The correlation of ULF waves and auroral intensity before, during and after substorm expansion phase onset

机译：ULF波和极光强度的相关性前、中、后亚暴扩张阶段发病

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摘要

We present case studies of the evolution of Ultra-Low Frequency (ULF) magnetic wave amplitudes and auroral intensity through the late growth phase and the expansion phase of the substorm cycle. We present strong evidence that substorm-related auroral enhancements are clearly and demonstrably linked to ULF wave amplitudes observed at the same location. In all three case studies presented, the correlation analysis shows that the ULF wave activity and auroral intensities are highly correlated at close to zero lag. We discuss four possible explanations that may be able to explain both the timing and the high correlations between these two phenomena, including a simple coincidence, an artifact of instrumental effects, the response of the ionosphere to magnetic waves and auroral particle precipitation, and finally, that ULF waves and auroral particle precipitation are physically linked at their source. We discount coincidence and instrumental effects since we present multiple events where instrumental effects have a negligible contribution, and we find that the ionospheric response to waves and precipitation can explain some, but not all, of the results contained within this paper. Specifically, the ionospheric response to substorm waves and auroral precipitation cannot explain the result backed up by previous studies that the onset of ULF wave activity and the onset of auroral particle precipitation occur at the same time and in the same location. This leaves the possibility that ULF waves and auroral particles are physically linked at their source. We therefore re-emphasize the importance of ULF wave observations in fully understanding the mechanism or mechanisms responsible for rapid auroral brightenings.
机译：我们现在发展的案例研究超低频磁波(ULF)通过后期振幅和极光强度增长阶段和扩张阶段的亚暴周期。substorm-related极光很明显的增强和ULF波振幅明显相关观察到相同的位置。研究提出,相关分析显示ULF波活动和极光强度在接近高度相关零延迟。这也许能够解释时间和这两个之间的高度相关性现象,包括一个简单的巧合,一个工件的工具性作用的反应电离层磁波和极光颗粒沉淀,最后,ULF海浪和极光粒子沉降身体与来源。因为我们巧合和工具性影响存在多个事件工具的地方影响的贡献可以忽略不计,和我们发现电离层响应波和降水可以解释一些,但不是全部包含在本文的结果。具体来说,电离层响应亚暴海浪和极光降水不能解释结果支持先前的研究ULF波活动的爆发和爆发极光粒子沉降发生的同时,在相同的位置。ULF波和极光的可能性粒子物理与来源。因此,我们强调ULF的重要性波观测的完全理解负责快速机制或机制极光明亮。

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