Lightning attachment process involving connection of the downward negative leader to the lateral surface of the upward connecting leader

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• 作者：Weitao LuLuwen ChcnYing MaV.A.RakovYan GaoYang ZhangQiyuan YinYijun Zhang
• 会议时间：2014-09-10
• 关键词：Lightning discharge ; Lightning attachment process ; Downward leader ; Upward connecting leader
• 作者单位：Weitao Lu,Ying Ma,Yan Gao,Yang Zhang,Yijun Zhang(Laboratory of Lightning Physics and Protection Engineering, Chinese Academy of Meteorological Sciences, Beijing, China;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China)Luwen Chcn,Qiyuan Yin(Lightning Protection Center of Guangdong Province, Guangzhou, China)V.A.Rakov(Department of Electrical and Computer Engineering, University of Florida,Gainesville, Florida, USA)
• 母体文献：第八届全国优秀青年气象科技工作者学术研讨会论文集
• 会议名称：第八届全国优秀青年气象科技工作者学术研讨会
• 会议地点：江苏宜兴
• 主办单位：中国气象学会
• 语种：chi

摘要

High-speed video camera records, with a temporal resolution of 20 μs and a spatial resolution of 2.4 m per pixel, of a downward negative lightning flash that terminated on a 440 m high building are examined.The attachment process in this flash exhibited an unexpected behavior in that the downward leader tip connected to the lateral surface of the ~400 m upward connecting leader (UCL) below its tip.It appears that the effect of the downward leader on the UCL is significant, while the effect of the UCL on the downward leader is negligible, except for the final 80 μs preceding the beginning of the first return stroke.The ratio of speeds of the downward leader and the UCL tends to decrease with time, ranging from 1.8 to 0.12, although the lower 80 to 100 m or so of the UCL were too faint to allow speed measurements.