DOI: 10.1002/2016JD025599
论文题名: An improved ray theory and transfer matrix method-based model for lightning electromagnetic pulses propagating in Earth-ionosphere waveguide and its applications
作者: Qin Z. ; Chen M. ; Zhu B. ; Du Y.-P.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 2 起始页码: 712
结束页码: 727
语种: 英语
英文关键词: Earth-ionosphere waveguide
; electromagnetic pulse
; lightning
; lightning sferic
Scopus关键词: atmospheric modeling
; atmospheric wave
; diffraction
; electromagnetic field
; electron density
; ionosphere
; lightning
; parameterization
; transfer function
; wave attenuation
; wave propagation
; waveform analysis
; China
英文摘要: An improved ray theory and transfer matrix method-based model for a lightning electromagnetic pulse (LEMP) propagating in Earth-ionosphere waveguide (EIWG) is proposed and tested. The model involves the presentation of a lightning source, parameterization of the lower ionosphere, derivation of a transfer function representing all effects of EIWG on LEMP sky wave, and determination of attenuation mode of the LEMP ground wave. The lightning source is simplified as an electric point dipole standing on Earth surface with finite conductance. The transfer function for the sky wave is derived based on ray theory and transfer matrix method. The attenuation mode for the ground wave is solved from Fock's diffraction equations. The model is then applied to several lightning sferics observed in central China during day and night times within 1000 km. The results show that the model can precisely predict the time domain sky wave for all these observed lightning sferics. Both simulations and observations show that the lightning sferics in nighttime has a more complicated waveform than in daytime. Particularly, when a LEMP propagates from east to west (Φ = 270°) and in nighttime, its sky wave tends to be a double-peak waveform (dispersed sky wave) rather than a single peak one. Such a dispersed sky wave in nighttime may be attributed to the magneto-ionic splitting phenomenon in the lower ionosphere. The model provides us an efficient way for retrieving the electron density profile of the lower ionosphere and hence to monitor its spatial and temporal variations via lightning sferics. ©2017. American Geophysical Union. All Rights Reserved. 资助项目: 41075001
; 41374160
; PolyU5123/13E
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62727
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Building Service Engineering, Hong Kong Polytechnic University, Hong Kong; CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China
Recommended Citation:
Qin Z.,Chen M.,Zhu B.,et al. An improved ray theory and transfer matrix method-based model for lightning electromagnetic pulses propagating in Earth-ionosphere waveguide and its applications[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(2)