气候变化领域集成服务门户(CCPortal): Experimental Investigation of the Streamer Zone of Long-Spark Positive Leader Using High-Speed Photography and Microwave Probing

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DOI	10.1029/2019JD031826
	Experimental Investigation of the Streamer Zone of Long-Spark Positive Leader Using High-Speed Photography and Microwave Probing
	Bogatov N.A.; Kostinskiy A.Y.; Syssoev V.S.; Andreev M.G.; Bulatov M.U.; Sukharevsky D.I.; Mareev E.A.; Rakov V.A.
发表日期	2020
ISSN	2169897X
卷号	125 期号:11
英文摘要	The streamer zone of positive leader during the breakthrough phase of long sparks was experimentally investigated with two methods. One of the methods is the analysis of streamer-zone images obtained with a high-speed framing camera with image enhancement. This method allowed us to estimate the spatial distribution of streamer density and low-frequency conductivity in the streamer zone. The other method is the microwave probing, which we applied for the first time to long sparks. The attenuation of microwave beam in the streamer zone in our experiments is proportional to the total number of free electrons inside the microwave beam. Experimental data on the microwave attenuation combined with the streamer density found using the first method allowed us to estimate the total number of free electrons in one streamer. The following parameters were obtained. The streamer density in the center of the streamer zone is (0.6–1) · 105 m−3, and the total number of streamers in the streamer zone is 4 · 105–106. The average total number of free electrons in one streamer is about 3 · 1010. Low-frequency conductivity on the axis of streamer zone was estimated to be typically 2 · 10−5 S/m, which is similar to that estimated for corona sheath in lightning. Both methods are based on the assumption of constancy of electric field and similarity of all streamers inside the streamer zone. The overall results of this study are generally consistent with this assumption. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	high-speed photography; long sparks; microwave probing; positive leader; streamer zone
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185978
作者单位	Institute of Applied Physics RAS, Nizhny Novgorod, Russian Federation; National Research University Higher School of Economics, Moscow, Russian Federation; High-Voltage Research Center of the Zababakhin All-Russian Scientific Research Institute of Technical Physics, Istra, Moscow, Russian Federation; Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL, United States
推荐引用方式 GB/T 7714	Bogatov N.A.,Kostinskiy A.Y.,Syssoev V.S.,et al. Experimental Investigation of the Streamer Zone of Long-Spark Positive Leader Using High-Speed Photography and Microwave Probing[J],2020,125(11).
APA	Bogatov N.A..,Kostinskiy A.Y..,Syssoev V.S..,Andreev M.G..,Bulatov M.U..,...&Rakov V.A..(2020).Experimental Investigation of the Streamer Zone of Long-Spark Positive Leader Using High-Speed Photography and Microwave Probing.Journal of Geophysical Research: Atmospheres,125(11).
MLA	Bogatov N.A.,et al."Experimental Investigation of the Streamer Zone of Long-Spark Positive Leader Using High-Speed Photography and Microwave Probing".Journal of Geophysical Research: Atmospheres 125.11(2020).