NDLI: Step-like characteristics of an upward positive leader in triggered lightning

Content Provider	IEEE Xplore Digital Library
Author	Rubin Jiang Xiushu Qie Caixia Wang Jing Yang
Copyright Year	2011
Description	Author affiliation: Key Laboratory of Middle Atmosphere and Global Environment Observation (LAGEO), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China (Rubin Jiang; Xiushu Qie; Caixia Wang; Jing Yang)
Abstract	An upward positive leader in a rocket-triggered lightning flash was analysed based on high-speed video images with a time resolution of 10,000 fps and channel base current. The luminous intensity at the leader tip was stronger than that at the channel behind it. The average 2-D propagation speed of the leader was $1.0×10^{5}$ m/s during the early stage of its ascending, with partial speeds ranging from $2.0×10^{4}$ m/s to $1.8×10^{5}$ m/s between 130 m and 730 m above ground. The leader speed showed an accelerating tendency with height and time, however, an obvious irregularity of the speed was observed during the ascending of positive leader, which indicates a possible discontinuity of its extending process. Eleven current pulses, with peak values ranging from tens of amperes (A) to about 150 A, were clearly observed during the inception process of the upward positive leader. During the following ascending process, there were obvious fluctuations superimposed on the slow varying continuous current. Both the optical images and current waveforms indicate step-like properties of the upward positive leader.
Starting Page	614
Ending Page	617
File Size	248565
Page Count	4
File Format	PDF
ISBN	9781457714672
e-ISBN	9781457714665
DOI	10.1109/APL.2011.6110200
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-11-01
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Triggered lightning Speed Current measurement Wires Current pulse Lightning Lead Optical imaging Upward positive leader High speed optical techniques Optical pulses
Content Type	Text
Resource Type	Article

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