| 闪电初始放电阶段亚微秒电场变化波形特征 |
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| 引用本文： | 曹冬杰,郄秀书,杨静,等.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. |
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| 作者姓名： | 曹冬杰 郄秀书 杨静 等 |
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| 作者单位： | 1.中国科学院大气物理研究所中层大气和全球环境探测重点实验室, 北京 100029;中国科学院研究生院, 北京,100049 |
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| 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 |
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| 摘 要： | 本文选取2008年西藏羊八井地区与2009年东北大兴安岭地区快、 慢天线闪电电场变化仪观测资料, 对云闪起始阶段和地闪预击穿阶段亚微秒电场变化波形特征进行了统计分析, 发现, 无论是云闪还是地闪, 初始阶段快电场变化波形均表现为一系列脉冲形式, 且以归一化幅值小于0.5、 脉冲宽度小于等于10 μs的窄脉冲为主; 同低海拔地区相比, 高原地区地闪预击穿阶段脉冲总数相对较高, 窄脉冲所占比例相对较低, 幅值可与首次回击峰值相比拟的双极性大脉冲的发生比例较低。在统计的基础上, 对产生双极性脉冲的物理机制进行了分析, 发现较大的电流传输速度和电流衰减长度, 是导致双极性大脉冲波形幅值远大于其它脉冲的主要原因。
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| 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 |
Analysis on Characteristics of Sub-microsecond Electric Field Change Waveform during the Initial Stage of Lightning Discharge |
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| CAO Dongjie,QIE Xiushu,YANG Jing and et al.Analysis on Characteristics of Sub-microsecond Electric Field Change Waveform during the Initial Stage of Lightning Discharge[J].Chinese Journal of Atmospheric Sciences,2011,35(4):645-656. |
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| Authors: | CAO Dongjie QIE Xiushu YANG Jing and |
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| Affiliation: | 1.Key Laboratory of Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;Graduate University of Chinese Academy of Sciences, Beijing 1000492.Key Laboratory of Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | The characteristics of sub-microsecond electric field change waveforms during the initial stage of intracloud(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 flas... |
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| Keywords: | lightning initial stage of discharge sub-microsecond electric field change lower positive charge center(LPCC) modified transmission line model |
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