Comparative Analysis of the Initial Stage in Two Classical Artificially-triggered Lightning Flashes
A lightning flash, named 0503 in which the wire was not connected directly to the lightning rod but via a 5m length of nylon thread, has been triggered during SHATLE (Shandong Artificially Triggering Lightning Experiment, SHATLE). Synchronous data of the current, and close electric and magnetic fields have been obtained. The results show that the discharge processes of the initial stage (IS) in this triggered flash were different from the usual classical artificially-triggered lightning flash 0602 (the wire is connected with the rod directly) and altitude-triggered lightning. A large pulse with a current of 720A resulted from the breakdown of the 5m air gap occurred first during flash 0503, and the corresponding electric field at 60m from the rod was 0.38kV/m. The upward positive leader (UPL) propagated continuously after the large pulse. The geometric mean (GM) of the UPL peak current was 23.0A. The vaporization of the wire occurred during the initial continuous current (ICC) stage and the largest current pulse was about 400A. Comparing with triggered flash 0503, the discharge processes of IS in flash 0602 were simple, only two large pulses similar to each other, occurred before dart leader/return stroke sequences. The peak current of the first pulse was 2.1kA and its corresponding electric and magnetic fields at 60m from the lightning channel were 0.98 kV/m and 7.03μT, respectively. During the second pulse, the wire disintegrated. The current decreased to the background at the moment of the wire disintegration. The current of the second pulse in triggered flash 0602 was 2.8kA, and the corresponding electric and magnetic fields at 60m were 1.22kV/m and 9.01μT, respectively.
Jing Yang Xiushu Qie Qilin Zhang Yang Zhao Guili Feng Tinglong Zhang Xiangzhen Kong Guangshu Zhang
Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lab.of Middle Atmosphere and Global Environment Observation (LAGEO),Institute of Atmospheric Physics
国际会议
第13届国际大气电学会议(The 13th International Conference on Atmospheric Electricity)
北京
英文
2007-08-13（万方平台首次上网日期，不代表论文的发表时间）