大气科学2011，Vol.35Issue(4)：645-656,12.
闪电初始放电阶段亚微秒电场变化波形特征
Analysis on Characteristics of Sub-microsecond Electric Field Change Waveform during the Initial Stage of Lightning Discharge
摘要
Abstract
The characteristics of sub-microsecond electric field change waveforms during the initial stage of intra-cloud (IC) flashes and preliminary breakdown process of cloud-to-ground (CG) flashes have been studied based on the observation data. The data include fast electric field change and slow electric field change of IC flashes and CG flashes measured in Yangbajing of the Tibetan Plateau in 2008, and in Da Hinggan Ling in 2009. It is found that the electric field change waveforms during the initial stage of IC flashes and preliminary breakdown process of CG flashes appear as a series of pulses. The majority of pulses are narrow with pulse width less than or equal to 10 μs. The majority of pulses are weak with the normalized amplitude value less than 0. 5. Compared with the lower altitude area, the number of pulses during the preliminary breakdown process of negative CG flashes measured in the Tibetan Plateau is larger and the proportion of narrow pulses is smaller. The proportion of large bipolar pulses with large peak-to-peak amplitude that is equal to or larger than the peak amplitude of electric field change of the first return stroke is small Based on the statistics, the mechanism of discharge processes that produce bipolar pulses has been discussed theoretically. It is found that if the propagation speed of current pulse and the damp length of current pulse are large, the peak-to-peak amplitude of bipolar pulse will be large.关键词
闪电/初始放电阶段/亚微秒电场变化/下部正电荷区(LPCC)/传输线模型Key words
lightning, initial stage of discharge, sub-microsecond electric field change, lower positive charge center (LPCC), modified transmission line model分类
天文与地球科学引用本文复制引用
曹冬杰,郄秀书,杨静,王俊芳,王东方..闪电初始放电阶段亚微秒电场变化波形特征[J].大气科学,2011,35(4):645-656,12.基金项目
国家自然科学基金资助项目40774083、40930949,国家科技支撑计划项目2008BAC36B03,中国科学院百人计划资助项目 （）
