Observations of narrow bipolar events in East China

Details Observations of narrow bipolar events in East China Observations of narrow bipolar events in East China

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72..271z&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 2-3, p. 271-278.

Physics

1

Narrow Bipolar Events, Electrical/Channel Characteristics, Lighting Discharge

Scientific paper

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 [mu]s. 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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