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DOI | 10.1029/2018JD028644 |
Triggered Lightning Return Stroke Luminosity up to 1km in Two Optical Bands | |
Carvalho, F. L.1,2; Uman, M. A.1; Jordan, D. M.1; Wilkes, R. A.1; Kotovsky, D. A.1,3 | |
2018-09-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:17页码:9724-9740 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Luminosity waveforms measured using two types of avalanche photodiodes (APDs) are presented as a function of time and channel height for 15 triggered-lightning return strokes. Short vertical sections of 20 channel heights ranging from 0 to 1km were observed by both types of APDs. For APD type I, the return stroke luminosity waveforms decay faster following a single initial peak (IP) than the waveforms recorded by APD type II, which often exhibit a second maximum (SM) following the IP, though the risetimes of the initial luminosity wavefront preceding the IP are similar for both types of APDs. APD type II responds better to longer wavelengths than APD type I, and since the SM occurs about 10s after the IP at the channel-bottom and about 20s after the IP at 1-km height, the SM is likely a consequence of spectral lines excited during the cooling of the channel, following the initial high-temperature/pressure stage. The initial optical radiation during the return stroke is likely dominated by ionized atomic species radiated at higher temperatures (NII lines between 450 and 600nm) better captured by APD type I, while the later optical radiation is likely due to neutral atomic species radiated at lower temperatures (e.g., H-alpha at 656.3nm, OI at 715.7nm and 777.4nm, and the NI at 744.4nm) better captured by APD type II. The average IP upward speed is 1.3e8m/s, while the average SM upward speed is 3.1e7m/s. |
英文关键词 | triggered lightning luminosity spectroscopy photodiodes |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000445617500046 |
WOS关键词 | QUANTITATIVE-ANALYSIS ; QUALITATIVE-ANALYSIS ; PEAK CURRENT ; CHANNEL ; TIME ; PROPAGATION ; POWER ; ATTACHMENT ; INTENSITY ; DISCHARGE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32527 |
专题 | 气候变化 |
作者单位 | 1.Univ Florida, Dept Elect & Comp Engn, Gainesville, FL 32611 USA; 2.Space Explorat Technol Corp, Redmond, WA 98052 USA; 3.Los Alamos Natl Lab, Los Alamos, NM USA |
推荐引用方式 GB/T 7714 | Carvalho, F. L.,Uman, M. A.,Jordan, D. M.,et al. Triggered Lightning Return Stroke Luminosity up to 1km in Two Optical Bands[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(17):9724-9740. |
APA | Carvalho, F. L.,Uman, M. A.,Jordan, D. M.,Wilkes, R. A.,&Kotovsky, D. A..(2018).Triggered Lightning Return Stroke Luminosity up to 1km in Two Optical Bands.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(17),9724-9740. |
MLA | Carvalho, F. L.,et al."Triggered Lightning Return Stroke Luminosity up to 1km in Two Optical Bands".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.17(2018):9724-9740. |
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