DOI: 10.1002/2015GL064419
论文题名: Optical emissions associated with energetic electrons produced by stepping leaders in cloud-to-ground lightning discharges
作者: Xu W. ; Celestin S. ; Pasko V.P.
刊名: Geophysical Research Letters
ISSN: 0094-9093
EISSN: 1944-8824
出版年: 2015
卷: 42, 期: 13 起始页码: 5610
结束页码: 5616
语种: 英语
英文关键词: energetic radiation
; lightning
; optical emissions
; stepped leader
; terrestrial gamma-ray flashes
; X-ray emissions
Scopus关键词: Electric fields
; Electromagnetic wave emission
; Fluorescence
; Gamma rays
; Light emission
; Lightning
; Rockets
; X ray production
; X ray scattering
; Energetic radiation
; Optical emissions
; Stepped leader
; Terrestrial Gamma ray Flashes
; X-ray emission
; Clouds
; acceleration
; atmospheric electricity
; cloud to ground lightning
; electric field
; electron
; gamma ray radiation
; Monte Carlo analysis
; optical property
; radiation exposure
; X-ray spectroscopy
英文摘要: Both natural cloud-to-ground and rocket-triggered lightning flashes have been found to be associated with intense and brief bursts of X-ray emissions. Using a full energy Monte Carlo model combined with an optical emission model, we quantify the optical emissions induced by the strong acceleration of thermal runaway electrons in the highly inhomogeneous electric field produced by stepping lightning leaders. The results demonstrate that this acceleration process is accompanied with not only high-energy X-ray emissions but also detectable levels of optical emissions. The fluorescence beam exhibits a conical shape and appears to be larger than the streamer zone associated with the lightning leader. Moreover, we emphasize that the size of the fluorescence beam largely depends on the electrical properties of the associated lightning leader and the intensity ratio between emissions from the second positive band system of N2 and the first negative band system of N 2+ reflects the intrinsic difference in the energetics of electrons involved. Therefore, corresponding measurements compared to modeling results can provide useful information for understanding of the stepping mechanism of lightning leaders and associated X-ray production processes. Key Points Optical emissions from energetic electrons produced by lightning leaders Predictions on morphological and spectroscopic features of optical emissions Using optical emissions to evaluate the electrical properties of lightning leaders. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938214130&doi=10.1002%2f2015GL064419&partnerID=40&md5=941669ffbd1a234e304b97039e433faf
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8709
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Communications and Space Sciences Laboratory, Department of Electrical Engineering, Pennsylvania State University, University Park, PA, United States
Recommended Citation:
Xu W.,Celestin S.,Pasko V.P.. Optical emissions associated with energetic electrons produced by stepping leaders in cloud-to-ground lightning discharges[J]. Geophysical Research Letters,2015-01-01,42(13).