气候变化领域集成服务门户(CCPortal): Broadband VHF Observations of Two Natural Positive Cloud-to-Ground Lightning Flashes

CCPortal

DOI	10.1029/2019GL086915
	Broadband VHF Observations of Two Natural Positive Cloud-to-Ground Lightning Flashes
	Li S.; Qiu S.; Shi L.; Li Y.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:11
英文摘要	The characteristics of two natural positive cloud-to-ground flashes are analyzed in detail with the broadband very high frequency (VHF) mapping system. The bidirectional leader processes at the lightning initiation are observed, with negative leaders propagating upward and positive leaders propagating downward. The downward positive leaders can be divided into two stages, with scattered and slowly extending sources in the first stage and more concentrated and faster sources in the second stage. The overall extension speeds of the first stages are 1.8 × 104 and 2.7 × 104 m/s for the two flashes, and the speeds of the second stages are 7.8 × 105 and 1.0 × 106 m/s, respectively. The received peak power of the positive leaders is substantially lower than that for the negative leaders. The frequency characteristics show that the second stage emits more high-frequency radiation than the first stage, while there is no significant difference in low-frequency radiation content. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Lightning; Bidirectional leader; Cloud-to-ground lightning flash; Frequency characteristic; High-frequency radiation; Lightning initiation; Low frequency radiation; Positive cloud-to-ground flashes; Very high frequency; Clouds; cloud to ground lightning; concentration (composition); frequency analysis; mapping; net radiation; observational method; radiation balance
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170261
作者单位	National Key Laboratory on Electromagnetic Environmental Effects and Electro-Optical Engineering, Army Engineering University, Nanjing, China
推荐引用方式 GB/T 7714	Li S.,Qiu S.,Shi L.,et al. Broadband VHF Observations of Two Natural Positive Cloud-to-Ground Lightning Flashes[J],2020,47(11).
APA	Li S.,Qiu S.,Shi L.,&Li Y..(2020).Broadband VHF Observations of Two Natural Positive Cloud-to-Ground Lightning Flashes.Geophysical Research Letters,47(11).
MLA	Li S.,et al."Broadband VHF Observations of Two Natural Positive Cloud-to-Ground Lightning Flashes".Geophysical Research Letters 47.11(2020).