globalchange  > 影响、适应和脆弱性
DOI: 10.1002/jgrd.50276
论文题名:
Luminosity of initial breakdown in lightning
作者: Stolzenburg M.; Marshall T.C.; Karunarathne S.; Karunarathna N.; Vickers L.E.; Warner T.A.; Orville R.E.; Betz H.-D.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期:7
起始页码: 2918
结束页码: 2937
语种: 英语
Scopus关键词: Clouds ; Electric fields ; Lightning ; Electric field change ; Electromagnetic data ; First returns ; High-speed video ; Lightning flashes ; Linear segments ; Stepped leader ; Time-correlated ; Luminance ; atmospheric electricity ; cloud to ground lightning ; electromagnetic field ; luminescence
英文摘要: Time correlated high-speed video and electromagnetic data for 15 cloud-to-ground and intracloud lightning flashes reveal bursts of light, bright enough to be seen through intervening cloud, during the initial breakdown (IB) stage and within the first 3 ms after flash initiation. Each sudden increase in luminosity is coincident with a CG type (12 cases) or an IC type (3 cases) IB pulse in fast electric field change records. The E-change data for 217 flashes indicate that all CG and IC flashes have IB pulses. The luminosity bursts of 14 negative CG flashes occur 11-340 ms before the first return stroke, at altitudes of 4-8 km, and at 4-41 km range from the camera. In seven cases, linear segments visibly advance away from the first light burst for 55-200 μs, then the entire length dims, then the luminosity sequence repeats along the same path. These visible initial leaders or streamers lengthen intermittently to about 300-1500 m. Their estimated 2-D speeds are 4-18 × 105 m s-1 over the first few hundred microseconds and decrease by about 50% over the first 2 ms. In other cases, only a bright spot or a broad area of diffuse light, presumably scattered by intervening cloud, is visible. The bright area grows larger over 20-60 μs before the luminosity fades in about 100 μs, then this sequence may repeat several times. In several flashes, a 1-2 ms period of little or no luminosity and small E-change is observed following the IB stage prior to stepped leader development. © 2013. American Geophysical Union. All Rights Reserved.
资助项目: AGS-0813672 ; AGS-1016004 ; AGS-1110030 ; NNG05GJ72H ; NNX07AM36A
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被引频次[WOS]:79   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63840
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 Physics and Astronomy, University of Mississippi, PO Box 1848, University, MS 38677, United States; Department of Atmospheric and Environmental Sciences, South Dakota School of Mines and Technology, Rapid City, SD, United States; Department of Atmospheric Sciences, Texas A and M University, College Station, TX, United States; Physics Department, University of Munich, Garching, Germany; Nowcast GmbH, Munich, Germany

Recommended Citation:
Stolzenburg M.,Marshall T.C.,Karunarathne S.,et al. Luminosity of initial breakdown in lightning[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(7)
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