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	Spatial and temporal properties of optical radiation produced by stepped leaders
	Chen, ML; Takagi, N; Watanabe, T; Wang, DH; Kawasaki, ZI; Liu, XS
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
	1999-11-27
卷号	104期号:D22页码:27573-27584
ISSN号	2169-897X
通讯作者	Chen, ML(chen@cc.gifu-u.ac.jp)
英文摘要	The relative light intensities as a function of height and time for two negative downward stepped leaders, A and B, recorded by a high-speed digital 16 x 16 photodiode array photographic system, are studied. For leader A it is found that the light waveform for each segment of the leader channel starts with a series of sharp light pulses followed by several slow-rising and longer-lasting light surges, with both the light pulses and surges superimposed on a continuous luminosity slope that has a long rising front followed by an almost constant light level. Analysis indicates that each light pulse involves a step process; it originates at the leader tip and appears to propagate upward, with the pulse amplitude suffering little degradation within the first several tens of meters to 200 m from the leader tip up (bright tip length) but with a severe attenuation above. The light surges are observed to be almost constant in amplitude above the bright tip, and for one of them an upward propagation speed of the order of 10(8) mis is inferred. From appearances of the light pulses it is determined that the leader A has an overall velocity of 4.5-11.2 x 10(5) mis, a step interval of 5-50 mu s, and a step length of 7.9-19.8 m. For leader B the step light pulses are found to propagate from the leader tip back up ata speed of 0.14-1.7 x 10(8) m/s, and the overall leader velocity, the step interval, and the step length are determined to be about 4.9-5.8 x 10(5) m/s, 18-21 mu s, and 8.5 m, respectively. In addition, on the basis of the light waveforms of the leader A it is inferred that the current of a stepped leader may consist of two parts: an impulsive current within the bright tip and a continuing current above it. After propagating along the bright tip up, because of increasing resistance and capacitance of the leader channel the impulsive current rapidly transforms into part of the continuing current.
收录类别	SCI
WOS关键词	RETURN STROKES ; ELECTRIC-FIELD ; DART LEADERS ; PROPAGATION
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000083874700027
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2556640
专题	寒区旱区环境与工程研究所
通讯作者	Chen, ML
作者单位	1.Osaka Univ, Dept Elect Engn, Suita, Osaka 565, Japan 2.Chinese Acad Sci, Lanzhou Inst Plateau Atmospher Phys, Lanzhou 730000, Peoples R China 3.Gifu Univ, Fac Engn, Dept Elect Engn, Gifu 5011193, Japan
推荐引用方式 GB/T 7714	Chen, ML,Takagi, N,Watanabe, T,et al. Spatial and temporal properties of optical radiation produced by stepped leaders[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,1999,104(D22):27573-27584.
APA	Chen, ML,Takagi, N,Watanabe, T,Wang, DH,Kawasaki, ZI,&Liu, XS.(1999).Spatial and temporal properties of optical radiation produced by stepped leaders.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,104(D22),27573-27584.
MLA	Chen, ML,et al."Spatial and temporal properties of optical radiation produced by stepped leaders".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 104.D22(1999):27573-27584.

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