Prima Facie Evidence of the Fast Impact of a Lightning Stroke on the Lower Ionosphere
Prima Facie Evidence of the Fast Impact of a Lightning Stroke on the Lower Ionosphere
复制标题
雷击对低电离层快速影响的初步证据
DOI：
10.1029/2020gl090274
复制
发表时间：
2020-10
影响因子：
5.2
通讯作者：
Qiu Zongxu
中科院分区：
文献类型：
--
作者：
Qin Zilong;Chen Mingli;Lyu Fanchao;Cummer Steven A.;Gao Yan;Liu Feifan;Zhu Baoyou;Du Ya-ping;Usmani Asif;Qiu Zongxu
研究表明，强烈的闪电放电可以通过感应电磁场扰乱夜间较低的电离层。我们在这里报告的新证据表明，每次雷击，无论强度如何，都会对白天和夜间的低电离层产生影响。通过对我国南方数千次负云地雷击的分析，我们发现雷电群的天波特征与其源强密切相关。闪电强度增加的变化表明夜间电离层的反射率较高，但白天电离层的时间延迟较大。它还表明电离层在不到数十毫秒的时间内从闪电影响中恢复。这表明闪电产生的电磁场与较低的电离层之间存在直接且快速的非线性耦合，使得电离层对雷击的响应取决于闪电强度。其候选机制是焦耳热效应，但需要进一步的研究。
Studies show that intense lightning discharges can perturb nighttime lower ionosphere through induced electromagnetic fields. We report here new evidence that every lightning stroke, regardless of intensity, has an impact on both daytime and nighttime lower ionosphere. Through analysis of thousands of negative cloud‐to‐ground lightning strokes in southern China, we find that skywave features of a lightning sferic are closely related to its source intensity. Variations with increasing lightning intensity show a higher reflectivity from nighttime ionosphere but a larger time delay from daytime ionosphere. It also shows that the ionosphere recovers from the lightning impact in a time shorter than tens of milliseconds. This suggests that there exists a direct and fast nonlinear coupling between lightning‐generated electromagnetic fields and lower ionosphere, making the ionospheric response to a lightning stroke dependent of the lightning intensity. A candidate mechanism for this is the Joule heating effect, but it needs future studies.
登录
查看更多内容
影响因子：
--
作者：
F. Han;S. Cummer
通讯作者：
F. Han;S. Cummer
影响因子：
5.2
作者：
Robert A. Marshall;C. L. D. Silva;V. Pasko
通讯作者：
Robert A. Marshall;C. L. D. Silva;V. Pasko
影响因子：
2.8
作者：
Han, Feng;Cummer, Steven A.
通讯作者：
Cummer, Steven A.
影响因子：
--
作者：
R. C. Moore;C. Barrington-Leigh;U. Inan;T. Bell
通讯作者：
R. C. Moore;C. Barrington-Leigh;U. Inan;T. Bell
影响因子：
--
作者：
R. Newsome;U. Inan
通讯作者：
R. Newsome;U. Inan