Lightning observations and consideration of positive charge distribution inside thunderclouds using VHF broadband digital interferometry
Lightning observations and consideration of positive charge distribution inside thunderclouds using VHF broadband digital interferometry
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DOI：
10.1016/j.atmosres.2004.11.024
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发表时间：
2005-07
影响因子：
5.5
通讯作者：
T. Morimoto;Z. Kawasaki;T. Ushio
中科院分区：
文献类型：
--
作者：
T. Morimoto;Z. Kawasaki;T. Ushio
大阪大学闪电研究小组（LRG-OU）一直在开发一种基于“VHF宽带数字干涉测量”技术的新型闪电定位和监测系统。夏季在澳大利亚达尔文和冬季雷暴季节在日本福井进行了闪电观测。在这些观测中，闪电进展的成像是在空间和时间的四个维度上实现的。由于 VHF 脉冲主要由负击穿辐射，因此它们的源位置给出了正电荷分布。换句话说，宽带干涉仪不仅可以可视化负先导级数，还可以提供有关雷云内部正电荷分布的信息。查阅雷达观测结果证实了这一解释。
The Lightning Research Group of Osaka University (LRG-OU) has been developing a new type of lightning location and monitoring system based on a technique of “VHF broadband digital interferometry”. Lightning observations have been conducted in Darwin, Australia during summer and in Fukui, Japan during winter thunderstorm seasons. In these observations, imaging of lightning progression is realized in four-dimensions that means space and time. Since VHF impulses are radiated from mainly negative breakdowns, their source location gives the positive charge distribution. In other words, the broadband interferometer may not only visualize negative leader progressions but also give information on positive charge distribution inside thunderclouds. Consulting radar observations confirms this interpretation.