Observations of narrow bipolar events in East China
Observations of narrow bipolar events in East China
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华东地区狭隘两极事件观察
DOI:
10.1016/j.jastp.2009.12.002
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发表时间:
2010-02
影响因子:
1.9
通讯作者:
Ma, Ming
中科院分区:
文献类型:
--
作者:
Zhu, Baoyou;Zhou, Helin;Tao, Shanchang;Ma, Ming
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 7–12km altitude above mean sea level (MSL) with a mean altitude of 9.5km, and negative NBEs occurred at 14–16km 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 15kAkm, and 0.12Ckm, respectively. The mean time for the propagation of current front along the channel is 2.2μs. The upper limit on channel length for NBEs in this study is 510–1060m, the lower limit on discharge current amplitude is 12.5–43.2kA, and the minimum charge transfer is 0.1–0.3C.
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