气候变化领域集成服务门户(CCPortal): Orientation of Initial Breakdown Pulses and Leader Discharges by Magnetic Direction Finder

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DOI	10.1029/2019JD031407
	Orientation of Initial Breakdown Pulses and Leader Discharges by Magnetic Direction Finder
	Lu Z.; Qiu S.; Wang R.; Shi L.; Zhang P.
发表日期	2020
ISSN	2169897X
卷号	125 期号:6
英文摘要	For decades, the magnetic direction finder (MDF) technique has been used to give the azimuth of return stroke (RS) in cloud-to-ground lightning (CG). Due to the possible polarization error produced by inclined lightning channels, cloud flashes are excluded by most MDF waveform discrimination procedures. In this study, the capability of the orthogonal magnetic coils in determining the azimuth of the initial breakdown pulses (IBPs) and leaders in CG is analyzed and discussed. First, a lightning orthogonal magnetic field sensor with high sensitivity (about 33 nT/V) as well as broad bandwidth (3 kHz to 2 MHz) has been developed. According to the transmission line model, RSs with current 10 kA occurred within 500 km could be detected by this system theoretically. Thereafter, a theoretical analysis was derived in order to evaluate its polarization error with arbitrarily oriented lightning channels. In order to overcome the effect of random nonvertical channels on orientation results, a statistical MDF method is proposed. A field lightning observation was conducted in the year 2017, in which RSs, leaders, and IBPs in CG or cloud flash from two thunderstorms are oriented by the proposed MDF technique. The average azimuth difference between the mathematic expectation of leaders and corresponding RSs is 2.4°. Most of the azimuth in IBPs lies within the region of radar composite reflectivity above 45 dBZ, which indicates that the initiation location of lightning flashes in this study mostly located in these strong echo regions. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	IBP; leader; lightning; MDF; orientation
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/186115
作者单位	National Key Laboratory on Electromagnetic Environmental Effects and Electro-Optical Engineering, Army Engineering University, Nanjing, China; Teaching and Research Guarantee Center, Army Engineering University, Nanjing, China
推荐引用方式 GB/T 7714	Lu Z.,Qiu S.,Wang R.,et al. Orientation of Initial Breakdown Pulses and Leader Discharges by Magnetic Direction Finder[J],2020,125(6).
APA	Lu Z.,Qiu S.,Wang R.,Shi L.,&Zhang P..(2020).Orientation of Initial Breakdown Pulses and Leader Discharges by Magnetic Direction Finder.Journal of Geophysical Research: Atmospheres,125(6).
MLA	Lu Z.,et al."Orientation of Initial Breakdown Pulses and Leader Discharges by Magnetic Direction Finder".Journal of Geophysical Research: Atmospheres 125.6(2020).