气候变化领域集成服务门户(CCPortal): Circuitous attachment process in altitude-triggered lightning striking a 30-m-high tower

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DOI	10.1016/j.atmosres.2020.105049
	Circuitous attachment process in altitude-triggered lightning striking a 30-m-high tower
	Liu M.; Jiang R.; Li Z.; Qie X.; Zheng T.; Tan Y.; Li X.; Zhang H.; Liu M.; Sun Z.; Wang Y.; Ma Z.; Lu J.; Feng R.; Liu Y.
发表日期	2020
ISSN	0169-8095
卷号	244
英文摘要	The altitude rocket-and-wire technique was used to trigger lightning to strike a 30-m-high communication tower. A comprehensive dataset was obtained, including discharge current and electromagnetic-field changes, as well as high-speed video images. An attachment process with an abnormal circuitous S-shaped connection channel was observed between the lower extremity of the triggering wire and the tower top, with a total channel length of 25.3 m, which was much longer than the direct connection channel of 13.0 m. The downward negative leader from the triggering wire and the upward connecting positive leader from the tower top “missed” each other by a vertical distance of 4.1 m before turning to the horizontal direction and eventually completing the breakthrough phase. The attachment process produced a sharp current pulse with a duration of 19 μs and a peak of 11.6 kA, transiently promoting the upward positive leader development from the upper extremity of the triggering wire. The simulation of the background electric field indicated that the electric field surrounding the tips of the initial leaders did not involve a dominant direction with pronounced larger intensity. The leader streamer/corona zones with a divergent feature resulted in directional uncertainty for the initial steps. As the leaders developed and the associated streamer/corona zones expanded, the attraction effect was enhanced and the leaders turned to the horizontal direction. The common streamer zone (CSZ) developed when the gap between the leaders was about 8 to 9 m, resulting in the occurrence of the breakthrough phase and accomplishment of the attachment. For the last return stroke, the long interstroke interval facilitated channel cooling and a decrease in conductivity. This promoted the occurrence of a dart-stepped leader instead of dart leader, and led to the alteration of the attachment route from an S-shaped channel to a direct connection channel. © 2020
语种	英语
scopus关键词	Electromagnetic fields; High speed cameras; Lightning; Rockets; Timing circuits; Trigger circuits; Wire; Altitude-triggered lightning; Attachment process; Communication towers; Discharge currents; High-speed video images; Positive leaders; Upward positive leaders; Wire techniques; Towers; altitude; atmospheric electricity; data set; electromagnetic field; lightning; steel structure; uncertainty analysis
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141858
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Joint International Research Laboratory of Climate and Environment Change (ILCEC), Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing, 210044, China; Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China; Chengdu University of Information Technology, College of Electronic Engineering, Chengdu, 610225, China; Civil Aviation Telecommunications Development Co. Ltd, Beijing, 100122, China; ZTE CORPORATION, Shenzhen, 518057, China
推荐引用方式 GB/T 7714	Liu M.,Jiang R.,Li Z.,et al. Circuitous attachment process in altitude-triggered lightning striking a 30-m-high tower[J],2020,244.
APA	Liu M..,Jiang R..,Li Z..,Qie X..,Zheng T..,...&Liu Y..(2020).Circuitous attachment process in altitude-triggered lightning striking a 30-m-high tower.Atmospheric Research,244.
MLA	Liu M.,et al."Circuitous attachment process in altitude-triggered lightning striking a 30-m-high tower".Atmospheric Research 244(2020).