DOI: 10.1002/2015GL064451
论文题名: First images of thunder: Acoustic imaging of triggered lightning
作者: Dayeh M.A. ; Evans N.D. ; Fuselier S.A. ; Trevino J. ; Ramaekers J. ; Dwyer J.R. ; Lucia R. ; Rassoul H.K. ; Kotovsky D.A. ; Jordan D.M. ; Uman M.A.
刊名: Geophysical Research Letters
ISSN: 0094-9342
EISSN: 1944-9073
出版年: 2015
卷: 42, 期: 14 起始页码: 6051
结束页码: 6057
语种: 英语
英文关键词: beamforming
; imaging thunder
; lightning
; lightning energetics
; thunder acoustics
; thunder shock wave
Scopus关键词: Acoustic imaging
; Acoustics
; Beamforming
; Geometrical optics
; Lightning protection
; Shock waves
; Acoustic pressures
; Acoustic signature
; Frequency dependent
; International center for lightning research and testing
; Linear microphonearray
; Spatial resolution
; Strong correlation
; Triggered lightning
; Lightning
; acoustic data
; image analysis
; lightning
; quantitative analysis
; shock wave
; spatial resolution
; thunderstorm
; videography
英文摘要: An acoustic camera comprising a linear microphone array is used to image the thunder signature of triggered lightning. Measurements were taken at the International Center for Lightning Research and Testing in Camp Blanding, FL, during the summer of 2014. The array was positioned in an end-fire orientation thus enabling the peak acoustic reception pattern to be steered vertically with a frequency-dependent spatial resolution. On 14 July 2014, a lightning event with nine return strokes was successfully triggered. We present the first acoustic images of individual return strokes at high frequencies (>1kHz) and compare the acoustically inferred profile with optical images. We find (i) a strong correlation between the return stroke peak current and the radiated acoustic pressure and (ii) an acoustic signature from an M component current pulse with an unusual fast rise time. These results show that acoustic imaging enables clear identification and quantification of thunder sources as a function of lightning channel altitude. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938962144&doi=10.1002%2f2015GL064451&partnerID=40&md5=ee7df719a0437b0641d8f580c2af4656
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8957
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: Space Science and Engineering Division, Southwest Research Institute, San Antonio, TX, United States
Recommended Citation:
Dayeh M.A.,Evans N.D.,Fuselier S.A.,et al. First images of thunder: Acoustic imaging of triggered lightning[J]. Geophysical Research Letters,2015-01-01,42(14).