Observations of narrow bipolar events in East China |
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| Authors: | Baoyou Zhu Helin Zhou Ming Ma Shanchang Tao |
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| Institution: | 1. Department of Physics, University of Colombo, Colombo 3, Sri Lanka;2. Department of Engineering Sciences, Uppsala University, Uppsala, Sweden;1. China University of Petroleum, Qingdao, China;2. The Hong Kong Polytechnic University, Hong Kong;1. Department of Electrical and Electronic Engineering, Faculty of Engineering, The University of Nottingham Malaysia Campus, 43500 Semenyih, Selangor, Malaysia;2. Electrical and Computer Engineering School, College of Engineering, University of Tehran, Tehran 14395-515, Iran;3. Institute of High Voltage and High Current, School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru, Malaysia;4. Faculty of Engineering, Computing & Science, Swinburne University of Technology Sarawak, Malaysia;1. Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia;2. Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia |
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| Abstract: | Narrow bipolar events (NBEs) are a distinct class of intra-cloud lightning discharge. In this paper we present observations of 10 negative and 67 positive such events in East China. Positive NBEs occurred at 7–12 km altitude above mean sea level (MSL) with a mean altitude of 9.5 km, and negative NBEs occurred at 14–16 km altitude. Electrical/channel characteristics of these events were derived from NBE pulse waveforms based on the transmission-line model. On average, the peak current moment and the charge moment change of a NBE event is 15 kA km, and 0.12 C km, respectively. The mean time for the propagation of current front along the channel is 2.2 μs. The upper limit on channel length for NBEs in this study is 510–1060 m, the lower limit on discharge current amplitude is 12.5–43.2 kA, and the minimum charge transfer is 0.1–0.3 C. |
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