Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/6335
DC Field | Value | Language |
---|---|---|
dc.contributor | Department of Building Services Engineering | - |
dc.creator | Chen, ML | - |
dc.creator | Watanabe, T | - |
dc.creator | Takagi, N | - |
dc.creator | Du, PYP | - |
dc.creator | Wang, D | - |
dc.creator | Liu, X | - |
dc.date.accessioned | 2014-12-11T08:26:53Z | - |
dc.date.available | 2014-12-11T08:26:53Z | - |
dc.identifier.issn | 2169-897X | - |
dc.identifier.uri | http://hdl.handle.net/10397/6335 | - |
dc.language.iso | en | en_US |
dc.publisher | Wiley-Blackwell | en_US |
dc.rights | Copyright 2003 by the American Geophysical Union. | en_US |
dc.subject | Altitude-triggered lightning | en_US |
dc.subject | Bidirectional leader | en_US |
dc.subject | Mini-return stroke | en_US |
dc.title | Simultaneous observations of optical and electrical signals in altitude-triggered negative lightning flashes | en_US |
dc.type | Journal/Magazine Article | en_US |
dc.description.otherinformation | Author name used in this publication: Chen, Mingli. | en_US |
dc.description.otherinformation | Author name used in this publication: Du, Yaping. | en_US |
dc.identifier.volume | 108 | - |
dc.identifier.issue | D8 | - |
dc.identifier.doi | 10.1029/2002JD002676 | - |
dcterms.abstract | 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 μs, 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 × 10⁸ 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 × 10⁷ 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 × 10⁵ m/s and its negatively charged part a downward speed of 2–2.6 × 10⁵ 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. | - |
dcterms.accessRights | open access | en_US |
dcterms.bibliographicCitation | Journal of geophysical research. Atmospheres, Apr. 2003, v. 108, no. D8, 4240 | - |
dcterms.isPartOf | Journal of geophysical research. Atmospheres | - |
dcterms.issued | 2003-04 | - |
dc.identifier.isi | WOS:000182593800004 | - |
dc.identifier.scopus | 2-s2.0-1642578991 | - |
dc.identifier.eissn | 2169-8996 | - |
dc.identifier.rosgroupid | r13476 | - |
dc.description.ros | 2002-2003 > Academic research: refereed > Publication in refereed journal | - |
dc.description.oa | Version of Record | en_US |
dc.identifier.FolderNumber | OA_IR/PIRA | en_US |
dc.description.pubStatus | Published | en_US |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
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Chen_simultaneous_observations_optical.pdf | 511.73 kB | Adobe PDF | View/Open |
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