DOI: 10.1002/2017JD026490
论文题名: A leader-return-stroke consistent macroscopic model for calculations of return stroke current and its optical and electromagnetic emissions
作者: Cai S. ; Chen M. ; Du Y. ; Qin Z.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 16 起始页码: 8686
结束页码: 8704
语种: 英语
英文关键词: EFIE equation
; electromagnetic field
; light emission
; lightning current
; lightning return stroke
英文摘要: A downward lightning flash usually starts with a downward leader and an upward connecting leader followed by an upward return stroke. It is the preceding leader that governs the following return stroke property. Besides, the return stroke property evolves with height and time. These two aspects, however, are not well addressed in most existing return stroke models. In this paper, we present a leader-return stroke consistent model based on the time domain electric field integral equation, which is a growth and modification of Kumar's macroscopic model. The model is further extended to simulate the optical and electromagnetic emissions of a return stroke by introducing a set of equations relating the return stroke current and conductance to the optical and electromagnetic emissions. With a presumed leader initiation potential, the model can then simulate the temporal and spatial evolution of the current, charge transfer, channel size, and conductance of the return stroke, furthermore the optical and electromagnetic emissions. The model is tested with different leader initiation potentials ranging from −10 to −140 MV, resulting in different return stroke current peaks ranging from 2.6 to 209 kA with different return stroke speed peaks ranging from 0.2 to 0.8 speed of light and different optical power peaks ranging from 4.76 to 248 MW/m. The larger of the leader initiation potential, the larger of the return stroke current and speed. Both the return stroke current and speed attenuate exponentially as it propagates upward. All these results are qualitatively consistent with those reported in the literature. ©2017. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62591
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 Services Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
Recommended Citation:
Cai S.,Chen M.,Du Y.,et al. A leader-return-stroke consistent macroscopic model for calculations of return stroke current and its optical and electromagnetic emissions[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(16)