Analysis of the Configuration Relationship Between the Morphological Characteristics of Lightning Channels and the Charge Structure Based on the Localization of VHF Radiation Sources
Analysis of the Configuration Relationship Between the Morphological Characteristics of Lightning Channels and the Charge Structure Based on the Localization of VHF Radiation Sources
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DOI：
10.1029/2022gl099586
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发表时间：
2022-07
影响因子：
5.2
通讯作者：
Yurui Li;Yang Zhang;Yijun Zhang;P. Krehbiel
中科院分区：
文献类型：
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作者：
Yurui Li;Yang Zhang;Yijun Zhang;P. Krehbiel
闪电通道形态与发育过程密切相关，而发育过程又取决于电荷结构。目前对闪电通道形态如何揭示闪电通道的发育特征和电荷结构缺乏了解。基于6次闪电的闪电测绘阵列辐射源定位数据，研究了闪电通道形态表征方法，得到了闪电通道分形维数（FD）的空间分布。研究发现，分形分布与河道发育特征具有一致的时空对应关系。与单向扩展通道的区域相比，通道分支或通道发育方向变化较多的区域FD更大，功率密度更高，水平通道发育加快。这些对应特征反映了口袋电荷的不均匀存在，为利用闪电形态信息揭示雷暴云内部电荷水平分布特征提供了一种新的方法。
The lightning channel morphology is closely related to developmental processes, which depends on the charge structure. There is currently a lack of understanding of how lightning channel morphology reveals developmental characteristics and charge structure. Based on the Lightning mapping array radiation source localization data of six lightning flashes, we studied the lightning channel morphology characterization method and obtained the spatial distribution of the fractal dimension (FD). We found that the fractal distribution had a consistent spatial and temporal correspondence with the channel development characteristics. Compared to regions with unidirectional extended channels, regions with more channel branches or direction change of channel development have a larger FD and a higher power density, where horizontal channel development is accelerated. These correspondence features reflect the inhomogeneous presence of pocket charge, which provides a new method to use lightning morphology information to reveal the characteristics of charge level distribution within thunderstorm clouds.