On the Variation of Optical Return Stroke Speed Along the Bottom of Lightning Channel
On the Variation of Optical Return Stroke Speed Along the Bottom of Lightning Channel
复制标题
闪电通道底部光学回程速度的变化研究
DOI：
10.1109/temc.2019.2916703
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发表时间：
2019-06
影响因子：
2.1
通讯作者：
Fan Yadong
中科院分区：
文献类型：
--
作者：
Zhou Mi;Su Xiaowei;Wang Jianguo;Lu Yongyin;Wang Daohong;Fan Yabei;Cai Li;Fan Yadong
在云对地闪电中，闪电沿闪电通道传播过程中回波速度的变化已被广泛报道。也有报道称，随着回程冲程向上传播，波形会发生畸变，导致波形上升时间增加，幅度减小。在本文中，我们人工产生模拟闪电通道底部60 m处畸变的光信号。利用六种斜率-截距法和五种峰值百分比法，我们分析了返回行程的高度相关畸变对估计光学返回行程速度的影响。我们表明，峰值百分比方法倾向于低估速度，而斜率-截距方法通常（但并非总是）首先低估实际速度，然后在回击向上传播时高估它们。对于较高的实际回冲程速度，这种偏差更为明显。此外，在假设实际回冲程速度恒定的情况下，各种方法估计的回冲程速度随通道底部高度的增加而增加，但随着高度的增加，增加趋势减弱。这种人为的增加是由火箭触发闪电沿闪电通道底部60米的返回击的估计二维传播速度观察到的。
In cloud-to-ground lightning flash, a varying return stroke speed during the propagation process along the lightning channel has been extensively reported. It is also reported that as the return stroke propagates upward, the waveform will be distorted, resulting in an increase in the rise time of waveform and a decrease in the magnitude. In this paper, we artificially generate the optical signal simulating the distortion along the lightning channel bottom 60 m. Using six slope-intercept methods and five percentage-of-peak methods, we analyze the influence of height-dependent distortion of the return stroke on the estimated optical return stroke speed. We show that the percentage-of-peak methods tend to underestimate the speeds, and that the slope-intercept methods, in general, but not always, first underestimate the actual speeds, and then overestimate them as the return stroke propagates upward. The deviations are more pronounced for higher actual return stroke speeds. Moreover, for an assumed constant actual return stroke speed, the estimated return stroke speeds by various methods increase with increasing heights in the channel bottom, although the increasing trends become weaker as the height increases. This artificial increase is observed from the estimated two-dimensional propagation speeds of return strokes along the lightning channel bottom 60 m in rocket-triggered lightning.
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影响因子：
5.5
作者：
S. Mallick;V. Rakov;D. Tsalikis;A. Nag;C. Biagi;D. Hill;D. Jordan;M. Uman;J. Cramer
通讯作者：
S. Mallick;V. Rakov;D. Tsalikis;A. Nag;C. Biagi;D. Hill;D. Jordan;M. Uman;J. Cramer
影响因子：
5.2
作者：
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通讯作者：
R. C. Olsen;D. Jordan;V. Rakov;M. Uman;N. Grimes
影响因子：
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J. Willett;V. P. Idone;R. Orville;C. Leteinturier;A. Eybert-Berard;L. Barret;E. Krider
影响因子：
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作者：
C. Nucci;G. Diendorfer;M. Uman;F. Rachidi;M. Ianoz;C. Mazzetti
通讯作者：
C. Nucci;G. Diendorfer;M. Uman;F. Rachidi;M. Ianoz;C. Mazzetti
影响因子：
2.1
作者：
Y. Baba;M. Ishii
通讯作者：
Y. Baba;M. Ishii