DOI: 10.1002/2013JD020501
论文题名: Rocket-and-wire triggered lightning in 2012 tropical storm Debby in the absence of natural lightning
作者: Pilkey J.T. ; Uman M.A. ; Hill J.D. ; Ngin T. ; Gamerota W.R. ; Jordan D.M. ; Rison W. ; Krehbiel P.R. ; Edens H.E. ; Biggerstaff M.I. ; Hyland P.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 23 起始页码: 13158
结束页码: 13174
语种: 英语
英文关键词: lightning mapping array
; triggered lightning
Scopus关键词: Electric fields
; Lightning protection
; Rockets
; Channel base current
; Cloud-to-ground discharge
; Cloud-to-ground flash
; Cloud-to-ground lightning
; Electric field waveform
; Lightning mapping array
; Triggered lightning
; Upward positive leaders
; Storms
; cloud to ground lightning
; electric field
; mapping
; precipitation (climatology)
; radar
; storm
; Florida [United States]
; United States
英文摘要: Lightning Mapping Array source locations, channel base currents, and electric field waveforms are presented for a lightning flash triggered in the rainbands of 2012 tropical storm Debby. The National Lightning Detection Network reported no natural cloud-to-ground discharges within 60 km of the North Florida triggering site for at least 20 h before and 8 h after the triggered flash. Additionally, local electric field mill and wideband antenna networks show no close cloud or cloud-to-ground flashes. The triggering rocket was launched with negative charge overhead producing an electric field at the ground of 5 kV m-1 and in coordination with X-band, dual-polarimetric radar observations of streamers of enhanced precipitation descending from the melting level as they approached the site. The Debby flash consisted of an initial stage (IS) followed by eleven leader/return stroke sequences. The flash exhibited all the processes of normal triggered and natural cloud-to-ground lightning: leader/return stroke sequences, continuing currents, K events, and M components. Additionally, the flash exhibited several exceptional characteristics: three return stroke peak currents greater than 25 kA, one very long, 352 ms, continuing current that transferred about 35 C of charge to ground, and a relatively short, 202 ms, IS containing no initial continuous current pulses. Following a near-vertical upward positive leader attaining 2.8 km height, the IS branched and propagated horizontally at 3.5 km altitude. The flash, exhibiting strokes and continuing current, then ascended to and propagated horizontally at 5.5 km, extending about 25 km south and 15 km east. The 0°C level was near 4.5 km above sea level. It follows from the above that clouds that are not producing natural lightning can represent a triggered lightning hazard to launch vehicles and aircraft. Key Points Lightning triggered in the complete absence of any natural lightning activity Four return strokes originated at an altitude below the 0° level Flash exhibited high peak current strokes and long-duration continuing currents ©2013. American Geophysical Union. All Rights Reserved. 资助项目: AGS-1063537
; NNK12EA79P
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63118
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 Electrical and Computer Engineering, University of Florida, Gainesville FL 32611, United States; Electrical Engineering Department, New Mexico Institute of Mining and Technology, Socorro NM, United States; Physics Department, New Mexico Institute of Mining and Technology, Socorro NM, United States; School of Meteorology, University of Oklahoma, Norman OK, United States; Stinger Ghaffarian Technologies, Kennedy Space Center, Merritt Island FL, United States; Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro NM, United States
Recommended Citation:
Pilkey J.T.,Uman M.A.,Hill J.D.,et al. Rocket-and-wire triggered lightning in 2012 tropical storm Debby in the absence of natural lightning[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(23)