Lightning attachment process involving connection of the downward negative leader to the lateral surface of the upward connecting leader
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.
Lightning discharge Lightning attachment process Downward leader Upward connecting leader
Weitao Lu Luwen Chcn Ying Ma V.A.Rakov Yan Gao Yang Zhang Qiyuan Yin Yijun Zhang
Laboratory of Lightning Physics and Protection Engineering, Chinese Academy of Meteorological Scienc Lightning Protection Center of Guangdong Province, Guangzhou, China Department of Electrical and Computer Engineering, University of Florida,Gainesville, Florida, USA
国内会议
江苏宜兴
英文
1-9
2014-09-10（万方平台首次上网日期，不代表论文的发表时间）