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Radiation and Optical Characteristics of the Negative Cloud-to-Ground Lightning Flash with Multiple Return Strokes

Journal

Plateau Meteorology

Authors

Yu Hai, Zhang Guangshu, Li Yajun, Wang Yanhui, Wu Bin, Zhang Rong, Lu Weitao

Year

2013

Volume

32

Issue

3

Pages

894-903

Corresponding Author

Yu, H

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Keywords

Cloud-to-ground with multiple return strokes; VHF interferometry; High-speed video camera; Dart leader; Radiation and optical characteristics

Abstract

A negative cloud-to-ground lightning flash with five return-strokes which occurred at Datong of Qinghai Province has been observed synchronously by using VHF narrowband radio interferometer and the high-speed video camera system. The characteristic of radiation and optics of lightning discharge channel has been analyzed. The results indicated that the optical channel brightness could supply the current characteristics of leader from the observation of interferometer, and interferometer observation could make up the weakness of optical equipment shoot weak discharge process and the lightning discharge in intracloud. The structure of channel that has been observed by interferometry and optical equipment is matched well. The radiation sources of the branch channel of interferometer observation are obvious, but the optical channel of branch appeared obviously later than the locating channel of interferometer with visible radiation sources. The magnitude of velocity of dart leader and stepped-dart leader is 10~6 m·s~(-1) using above two different calculated devices. However, interferometer has an advantage in acquiring time data and accurate quantification than the optical device. The velocity definition of the leader acquired by interferometer is higher than that of optical observation.
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