Lightning channels of cloud-to-ground flashes neutralizing multiple charge regions inside winter thunderclouds (特集 2009年環境電磁工学国際シンポジウム)
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概要
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Lightning Research Group of Osaka University (LRG-OU) has been developing and improving the VHF broadband digital interferometer (DITF) for thunderstorm observations. It enables us to locate the impulsive VHF radiation sources caused by lightning discharges with extremely high resolutions. As a result of the VHF observations during the 2007-2008 winter season in the Japan Sea coastal area, cloud-to-ground (CG) flashes that neutralize multiple charge regions inside thunderclouds are visualized by the VHF broadband DITF. The first flash is the positive CG flash that neutralizes multiple positive charge regions in a flash. The second flash is the bipolar lightning flash that neutralizes both positive and negative charge inside thunderclouds. In the case of bipolar lightning flashes, some tens millisecond after the return strokes, the subsequent negative breakdowns initiate from the proximities of the initiation points of the preceding negative stepped leaders. It was also found that the altitudes of negative charge regions are lower than 2km. The bipolar lightning flashes observed in this campaign neutralize positive charge after lowering the negative charge to the ground.
- 2010-05-01
著者
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Akita Manabu
Division of Electrical, Electric and Information Engineering, Graduate School of Engineering, Osaka
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Yoshida Satoru
Frontier Research Base for Global Young Researchers, Graduate School of Engineering, Osaka Universit
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Nakamura Yoshitaka
Division of Electrical, Electric and Information Engineering, Graduate School of Engineering, Osaka
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Morimoto Takeshi
Division of Electrical, Electric and Information Engineering, Graduate School of Engineering, Osaka
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Ushio Tomoo
Division of Electrical, Electric and Information Engineering, Graduate School of Engineering, Osaka
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Kawasaki Zen-Ichiro
Division of Electrical, Electric and Information Engineering, Graduate School of Engineering, Osaka
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Wang Daohong
Department of Electrical and Electronic Engineering, Faculty of Engineering, Gifu University
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Akita Manabu
Division Of Electrical Electric And Information Engineering Graduate School Of Engineering Osaka Uni
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Ushio Tomoo
Division Of Electrical Electric And Information Engineering Graduate School Of Engineering Osaka Uni
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Ushio Tomoo
Department Of Electrical Electronic And Information Engineering Osaka University
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Ushio Tomoo
Department Of Aero-space Engineering Osaka Prefecture University
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Ushio Tomoo
Department Of Communication Engineering Osaka University
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Kawasaki Zen-ichiro
Division Of Electrical Electric And Information Engineering Graduate School Of Engineering Osaka Uni
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Kawasaki Zen-ichiro
Department Of Communications Engineering Osaka University
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Morimoto Takeshi
Division Of Electrical Electric And Information Engineering Graduate School Of Engineering Osaka Uni
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Kawasaki Zen
Division Of Electrical Electric And Information Engineering Graduate School Of Engineering Osaka Uni
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Kawasaki Zen-ichiro
Osaka Univrsity
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Ushio Tomoo
Electric And Information Engineering Osaka University
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Wang Daohong
Department Of Electrical And Electronic Engineering Faculty Of Engineering Gifu University
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Morimoto Takeshi
Electric And Information Engineering Osaka University
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Yoshida Satoru
Frontier Research Base For Global Young Researchers Graduate School Of Engineering Osaka University
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Morimoto Takeshi
Department Of Communications Engineering Osaka University
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Nakamura Yoshitaka
Division Of Electrical Electric And Information Engineering Graduate School Of Engineering Osaka Uni
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Kawasaki Z
Faculty Of Engineering Toyama University
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Nakamura Yoshitaka
Division of Advanced Electronics and Optical Science, Department of Systems Innovation, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama-cho, Toyonaka, Osaka 560-8531, Japan
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