气候变化领域集成服务门户(CCPortal): The Polarity Reversal of Lightning-Generated Sky Wave

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DOI	10.1029/2020JD032448
	The Polarity Reversal of Lightning-Generated Sky Wave
	Hou W.; Azadifar M.; Rubinstein M.; Rachidi F.; Zhang Q.
发表日期	2020
ISSN	2169897X
卷号	125 期号:17
英文摘要	The polarity reversal of the lightning-generated first sky wave as a function of the observation distance is studied using a novel approach combining the finite-difference time domain (FDTD) method and the superposition principle of electromagnetic waves. In this method, the sky wave is generated by radiation from the induced current produced by the motion of charged particles driven by the lightning-radiated electromagnetic waves in the ionosphere. The horizontal and vertical components of the induced current density under the daytime and nighttime ionospheric conditions are evaluated. Their different contributions to the sky wave at different observation distances are analyzed in detail. Furthermore, a physical explanation for the polarity reversal in the time domain is proposed. It is found that, for relatively short observation distances (within ~200 km), the first sky wave is dominated by the component generated by the horizontal equivalent current in the Fresnel zone, while for longer observation distances (larger than ~300 km), the first sky wave is dominated by the component generated by the vertical equivalent current in the Fresnel zone. Since the polarities of the sky wave components generated by the vertical current source and horizontal current source are opposite, the polarity of the sky wave will reverse when increasing the observation distance. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185794
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster (CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, China; Electromagnetic Compatibility Laboratory, Swiss Federal Institute of Technology, Lausanne, Switzerland; School of Management and Engineering Vaud, University of Applied Sciences and Arts Western Switzerland, Yverdon-les-Bains, Switzerland
推荐引用方式 GB/T 7714	Hou W.,Azadifar M.,Rubinstein M.,et al. The Polarity Reversal of Lightning-Generated Sky Wave[J],2020,125(17).
APA	Hou W.,Azadifar M.,Rubinstein M.,Rachidi F.,&Zhang Q..(2020).The Polarity Reversal of Lightning-Generated Sky Wave.Journal of Geophysical Research: Atmospheres,125(17).
MLA	Hou W.,et al."The Polarity Reversal of Lightning-Generated Sky Wave".Journal of Geophysical Research: Atmospheres 125.17(2020).