人工触发闪电中的M分量特征  

Characteristic of M-component in Artificially-Initiated Triggered Lightning

作　　者：赵阳[1] 郄秀书[2] 陈明理[3] 孔祥贞[1] 张广庶[1] 张彤[1] 张廷龙[1] 冯桂力[4] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所寒旱区陆面过程与气候变化重点实验室,甘肃兰州730000 [2]中国科学院大气物理研究所中层大气与全球环境探测实验室,北京100029 [3]香港理工大学屋宇设备工程学系,香港00852 [4]山东省雷电防护技术中心,山东济南250031

出　　处：《高原气象》2011年第2期508-517,共10页Plateau Meteorology

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-206-2);国家自然科学基金项目(40605003;41005003;40775004;40905001)共同资助

摘　　要：利用2005-2008年期间在山东开展的人工触发闪电试验中所观测到的通道底部电流、不同距离垂直电场及高速摄像光学资料,对人工触发闪电10次回击之后的33次M分量电流波形进行了分析。结果表明,典型的M分量电流波形具有较对称的结构特征,峰值电流的几何平均值为743 A（标准偏差为0.55）;波形10%~90%上升时间的几何平均值为241μs（标准偏差为0.46）;M分量的半峰值宽度的几何平均值为318μs（标准偏差为0.36）;M分量持续时间的几何平均值为1.1 ms（标准偏差为0.24）。人工触发闪电的回击与其后发生的M分量相比,波形明显偏窄,M分量的幅值明显小于回击。对M分量参数之间的相关性分析表明,M分量的上升时间、半峰值宽度和持续时间3个参数之间具有很好的相关性,上升时间与半峰值宽度和持续时间的相关系数分别为0.84和0.73;持续时间和半峰值宽度的相关系数为0.7。M分量的峰值电流与半峰值宽度、上升时间和持续时间之间具有负相关性,相关系数分别为-0.47,-0.45和-0.37。Using the channel base current,vertical lightning field of different distances and optical data of high camera obtained from artificially-initiated triggered lightning experiment of Shandong in the period of 2005-2008.A statistical analyses of the characteristics of current waveforms for 33 M-components in 10 return strokes have been done.The results show that a typical M-component in triggered lightning is characterized by a more or less symmetrical current waveform.The geometric mean values of peak current of M-component,10%~90% risetime on wavefront,the half-peak width,duration are 743 A,241 μs,318 μs and 1.1 ms,respectively.The logarithmic standard deviations of these parameters are 0.55,0.46,0.36 and 0.24,respectively.The waveform of return stroke in triggered lightning is wilder than M-component and the peak current of later is lower than the former.There is a relatively well correlation between half-peak width,duration and rise time.There is a correlation between the risetime and half-peak width（correlation coefficient is 0.84）,and between the risetime and duration（correlation coefficient is 0.73）.The correlation coefficient of duration and half-peak width is 0.7.The correlation between half-peak width,risetime,duration and peak current is negative,the correlation coefficient are-0.47,-0.45 and-0.37,respectively.

关 键 词：人工触发闪电 回击 连续电流 M分量 电流参数 

分 类 号：P427.3[天文地球—大气科学及气象学]