Simultaneous observations of optical and electrical signals in altitude-triggered negative lightning flashes
文献类型：期刊论文
| 作者 | Chen, ML; Watanabe, T; Takagi, N; Du, YP; Wang, DH; Liu, XS |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
 |
| 出版日期 | 2003-04-18 |
| 卷号 | 108期号:D8页码:17 |
| 关键词 | altitude-triggered lightning bidirectional leader mini-return stroke |
| ISSN号 | 2169-897X |
| DOI | 10.1029/2002JD002676 |
| 通讯作者 | Chen, ML(bemlchen@polyu.edu) |
| 英文摘要 | [1] This paper presents an analysis of the experimental data on five negative lightning flashes initiated using the altitude-triggering technique in China. The data include highly time-resolved optical images and electric fields measured 60 m and 1300 m from the lightning channel. The triggering technique involves the launching upward of a small rocket trailing a wire electrically floating. The data show that these 5 flashes have a similar chronological sequence of events, including a bidirectional leader system followed by a mini-return stroke and a bidirectional discharge process. The bidirectional leader system consists of an upward positive leader initiated from the top of the wire and a downward negative stepped leader from the bottom, with the onset of the former prior to the latter by 3 to 8.3 ms. The downward negative stepped leader, having a step interval of 12 - 30 mus, appears to pause and resume several times while the upward positive leader extends forward continuously. With the downward negative stepped leader close to ground, a mini-return stroke occurs between the ground and the bottom of the wire. The mini-return stroke propagates upward with a speed of 1 - 2 x 10(8) m/s and emits intense light signals similar to a normal return stroke below the bottom of the wire. It becomes invisible after entering the bottom of the wire and appears again as a bright upward discharge from the top of the wire several microseconds later. This upper bright discharge ceases after propagating forward several hundred meters at a speed of 1.5 - 5.4 x 10(7) m/s. The cessation of the upper bright discharge is obviously associated with the disintegration of the wire at that moment. Right after the cessation of the upper bright discharge, a bidirectional discharge process starts from the bottom of the wire with its positively charged part having an upward speed of 3 - 10 x 10(5) m/s and its negatively charged part a downward speed of 2 - 2.6 x 10(5) m/s. Reflection of current waves at the bottom of the wire due to the explosion of the wire at that moment may be a major reason for the occurrence of this lower bidirectional discharge. |
| 收录类别 | SCI |
| WOS关键词 | STEPPED LEADERS |
| WOS研究方向 | Meteorology & Atmospheric Sciences |
| WOS类目 | Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000182593800004 |
| 出版者 | AMER GEOPHYSICAL UNION |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2557990 |
| 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.Hong Kong Polytech Univ, Dept Bldg Serv Engn, Kowloon, Hong Kong, Peoples R China 2.Gifu Univ, Dept Elect & Elect Engn, Gifu, Japan 3.Chinese Acad Sci, Cold & Arid Reg & Environm Engn Inst, Lanzhou, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, ML,Watanabe, T,Takagi, N,et al. Simultaneous observations of optical and electrical signals in altitude-triggered negative lightning flashes[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2003,108(D8):17. |
| APA | Chen, ML,Watanabe, T,Takagi, N,Du, YP,Wang, DH,&Liu, XS.(2003).Simultaneous observations of optical and electrical signals in altitude-triggered negative lightning flashes.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,108(D8),17. |
| MLA | Chen, ML,et al."Simultaneous observations of optical and electrical signals in altitude-triggered negative lightning flashes".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 108.D8(2003):17. |
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来源：寒区旱区环境与工程研究所
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