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DOI	10.1016/j.atmosres.2020.105000
	Electric field change and VHF waveforms of Positive Narrow Bipolar Events in Mississippi thunderstorms
	Bandara S.; Marshall T.; Karunarathne S.; Stolzenburg M.
发表日期	2020
ISSN	0169-8095
卷号	243
英文摘要	Positive Narrow Bipolar Events (+NBEs) in Mississippi thunderstorms were studied using fast antennas (FA, bandwidth 16 Hz - 2.6 MHz) and VHF antennas (Log-RF, bandwidth 186–192 MHz). The waveform characteristics of 201 positive NBEs were determined using both sensors. The +NBEs were classified in two ways: by FA waveform into Types A-D and by +NBE occurrence relative to other lightning events into three groups called Isolated, Not-Isolated, and INBE. (An INBE initiates an intracloud flash.) The FA waveform properties of 188 positive NBEs were mainly in reasonable agreement with previous studies. The VHF waveform properties of +NBEs have not been studied previously. The VHF powers of 201 positive NBE ranged from 0.1–88.4 kW with an average value of 7.8 kW. Types C and D positive NBEs tended to be more energetic (average VHF powers of 9.2 and 13.2 kW) than Types A and B (average powers of 1.9 and 4.0 kW). The INBE group of +NBEs had a larger range of VHF powers (0.2–88.4 kW) than the combined power range of the Not-Isolated and Isolated groups (0.1–26.7 kW). The INBE group also had a larger average peak power (9.9 kW) than the Not-Isolated and Isolated Groups (4.0 and 8.7 kW, respectively). However, 53% of INBEs had peak VHF power < 5 kW, so an INBE does not require a large power to initiate an intracloud flash. For 90% of the 201 positive NBEs the magnitude of the time difference between the FA peak amplitude and the Log-RF peak power was ≤2 μs, but the FA peak amplitude showed almost no correlation with the Log-RF peak power. © 2020 The Authors
关键词	Antennas Bandwidth Electric fields Average values Electric field change Intracloud flash Narrow bipolar events Peak amplitude Time-differences VHF antennas Waveform characteristics Thunderstorms amplitude electric field lightning sensor thunderstorm waveform analysis Mississippi United States
语种	英语
来源机构	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132427
推荐引用方式 GB/T 7714	Bandara S.,Marshall T.,Karunarathne S.,et al. Electric field change and VHF waveforms of Positive Narrow Bipolar Events in Mississippi thunderstorms[J]. Atmospheric Research,2020,243.
APA	Bandara S.,Marshall T.,Karunarathne S.,&Stolzenburg M..(2020).Electric field change and VHF waveforms of Positive Narrow Bipolar Events in Mississippi thunderstorms.,243.
MLA	Bandara S.,et al."Electric field change and VHF waveforms of Positive Narrow Bipolar Events in Mississippi thunderstorms".243(2020).