Elve doublets and compact intracloud discharges
Elve doublets and compact intracloud discharges
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DOI：
10.1002/2015gl064862
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发表时间：
2015-07
影响因子：
5.2
通讯作者：
Robert A. Marshall;C. L. D. Silva;V. Pasko
中科院分区：
文献类型：
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作者：
Robert A. Marshall;C. L. D. Silva;V. Pasko
我们提出了闪电的电离层光学特征的证据，称为精灵，有时会出现在时间上相隔1080 -160 μs的成对。我们证明，这些“精灵双峰”是电离层签名的紧凑的云内放电（CID），这是非常强大的，紧凑的放电，被认为是发生在雷暴云的顶部附近。在本文中，使用简单的几何计算和充分的电磁模拟，我们表明，CID从海拔14-22公里解释的时间延迟观察elve双峰，符合典型的CID高度。此外，我们还发现第一和第二极线的相对亮度可能与CID的取向有关，与垂线成5° ~ 20°的角度与观测到的亮度比一致。
We present evidence of ionospheric optical signatures of lightning, known as elves, which sometimes occur in pairs separated in time by ∼80–160 μs. We demonstrate that these “elve doublets” are the ionospheric signature of compact intracloud discharges (CIDs), which are extremely powerful, compact discharges that are thought to occur near the tops of thunderclouds. In this paper, using simple geometric calculations and full electromagnetic simulations, we show that CIDs from altitudes 14–22 km explain the time delay observed in elve doublets, consistent with typical CID altitudes. Furthermore, we show that the relative brightness of the first and second elves in the doublet is likely related to the orientation of the CID, and angles of 5°– 20° with respect to the vertical are consistent with the observed brightness ratios.