短基线时间差闪电辐射源探测系统和初步定位结果  

Short-Baseline Time-of-Arrival Lighting Radiation Detection System and Preliminary Location Result

作　　者：张泉[1] 郄秀书[1] 张广庶[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《高原气象》2003年第3期226-234,共9页Plateau Meteorology

基　　金：中国科学院知识创新工程重要方向项目(KZCX2 201);国家自然科学基金"十五"重点项目(40135010)资助

摘　　要：介绍了一种新型的闪电探测设备———短基线时间差法辐射源定位系统,并选取2002年夏季野外观测实验中的辐射源定位结果,结合电场变化特征分别对两次地闪和云闪进行了分析。结果表明,该系统对地闪先导过程和云闪产生的辐射源能够较好地定位。定位结果的个例分析证实,观测地区的两次云闪放电过程都由起始于云下部负电荷区的负极性击穿引发,然后向上发展到上部正电荷区,通道的发展速度约为1.29×105m·s-1,地闪梯级先导的传播速度约为1.73×105m·s-1。This paper introduced a new developedlighting detection equipment: Short\|baseline time\|of\|arrival lighting radiation detection system. The system has been used in the lightingobservation experimentin the summer of 2002. Two cloud\|to\|ground(C\|G) lighting dischanges and two intracloud (IC) lighting discharges are analyzed in this paper, respectively, by combining the characteristic of electric field change. The results indicated that this system works well for the radiation produced by IC lighting and the stepped leader of C\|G lighting. It has been found that the discharge processes of two IC lighting in the observation region were initiated by the negativepolarity breakdown started from the negative charge area in the lower part of the cloud, then progressed upward to the positive charge area in the upper part of the cloud. The progression velocity of the discharge channelwas estimated to be about 1.29×105m·s\+\{-1\}, and the velocity of stepped leader of C\|G lighting was about 1.73×105m·s\+\{-1\}.

关 键 词：闪电辐射源 短基线 时间差 放电过程 

分 类 号：P427.32[天文地球—大气科学及气象学]