Progression Features of Dart Leaders in Natural Negative Cloud‐to‐Ground Lightning Flashes

Huang, Haitao; Wang, Daohong; Wu, Ting; Takagi, Nobuyuki

doi:10.1029/2019jd030990

Cited by 7 publications

(6 citation statements)

References 21 publications

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“…two leaders propagate and compete in the same channel. Different from type β 2 stepped leaders, the leaders reported here are dart leaders descending continuously with a higher speed in the residual channel left by preceding return strokes instead of the virgin air, whose optical characteristics have been well studied 16 – 20 .…”

Section: Introductionmentioning

confidence: 94%

Leader-chasing behavior in negative artificial triggered lightning flashes

Wang

et al. 2021

Sci Rep

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Two special cases of dart leader propagation were observed by the high-speed camera in the leader/return stroke sequences of a classical triggered lightning flash and an altitude-triggered lightning flash, respectively. Different from most of the subsequent return strokes preceded by only one leader, the return stroke in each case was preceded by two leaders occurring successively and competing in the same channel, which herein is named leader-chasing behavior. In one case, the polarity of the latter leader was opposite to that of the former leader and these two combined together to form a new leader, which shared the same polarity with the former leader. In the other case, the latter leader shared the same polarity with the former leader and disappeared after catching up with the former leader. The propagation of the former leader in this case seems not to be significantly influenced by the existence of the latter leader.

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Section: Introductionmentioning

confidence: 94%

Leader-chasing behavior in negative artificial triggered lightning flashes

Wang

et al. 2021

Sci Rep

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“…The dart leader is a downward leader produced after the return stroke. It moves in the same path as the first return stroke discharge but in the opposite direction [48]. The dart Fire 2024, 7, 79 6 of 28 leader is formed by the excess negative charges in the return stroke.…”

Section: Stages Of Cloud-to-ground Lightningmentioning

confidence: 99%

Lightning-Induced Wildfires: An Overview

Song,

Xu,

et al. 2024

Fire

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Wildfire causes environmental, economic, and human problems or losses. This study reviewed wildfires induced by lightning strikes. This review focuses on the investigations of lightning mechanisms in the laboratory. Also, the paper aims to discuss some of the modeling studies on lightning-induced wildfires at different geographical locations using satellite-recorded lightning data and different statistical analyses. This review established that irrespective of the different models used to predict lightning wildfires, there is still a lack of understanding of the lightning-strike ignition mechanism; few experiments have been modeled to establish the dynamics of lightning-strike ignition. Therefore, further research needs to be carried out in this area to understand lightning ignition. It was ascertained from the various statistical modeling that lightning-induced wildfires are exacerbated by the abundant availability of fuel with a lower moisture content and high lightning efficiency. Moreover, because of changes in the climate and weather conditions, i.e., harsh weather and climate conditions due to anthropogenic activities, lightning-induced ignition wildfires have increased over the years, and they are expected to increase in the future if the climate and weather conditions continue to aggravate. Although various modeling studies have identified that lightning-induced wildfires have increased recently, no preventive measures have been conclusively proposed to reduce lightning-caused wildfires. Hence, this aspect of research has to be given critical attention. This review presents information that gives a profound understanding of lightning-induced wildfires, especially factors that influence lightning wildfires, and the state-of-the-art research that has been completed to understand lightning-induced wildfires.

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“…As described in detail by Wang et al (2017) and Huang et al (2019), LAPOS 5 consists of a camera body, a 108×16 optical fiber array, multiple photodiodes and their amplifiers, and two digital storage oscilloscopes. Each line of the fiber array corresponds to one observation segment of LAPOS5, and can individually guide the light from a corresponding section of lightning channel to photodiodes.…”

Section: Instrumentation and Datamentioning

confidence: 99%