成都地区雷电物理特征分析  

Analysis on Charateristics of Lightning Physics in Chengdu

作　　者：王小亚 闫景东 李楠 

机构地区：[1]山东省聊城市气象局,山东聊城252000 [2]山东省冠县气象局,山东冠县252500

出　　处：《农业灾害研究》2017年第2期39-42,共4页Journal of Agricultural Catastrophology

摘　　要：通过利用快、慢天线电场变化测量仪和地面大气电场仪对成都地区的雷电物理特征进行分析,得到了以下主要结论和结果:闪电在短时间内可引起较大的电场变化,在一次雷暴天气中短降水可改变大气电场极性。只存在一次回击的地闪最多,占总地闪数的28.57%,地闪回击最多达到18次,平均为5.9次。多回击地闪的间隔时间分布比率最高的为20~30 ms和20~40 ms。在地闪的持续放电过程中,通常都具有较长时间的连续电流或者是连接过程,并具有叠加在连接过程上的K过程,连续电流持续时间分布最多的为100~150 ms,占总数的26.09%。云闪通常具有初始阶段、极活跃阶段和最后阶段3个完整的放电阶段,通常在持续几百毫秒的电场变化比较缓慢的J过程上都叠加有对应反冲负流光过程的K过程。The physical characteristics of lightning flashes in thunderstorms occurred in Chengdu have been analyzed by using the instruments such as the fast and slow antennas, electric field mill. It has been found that the electric field can be changed in a large extent by lightning flashes in a very short time and much heavy precipitation in short time can change the polarity of electric field. About 28.57% of CG lightning flashes just have one return stroke. The largest number of return strokes in a CG lightning flash is 18, and the average value is 5.9. The highest percentage of gap time of multiple CG lightning dwells in 20-30 ms and 20 -40 ms. During the continuous current discharge in lightning, usually there is a long time of continuous current or connection as well as a K process which is added to the connection process, most of the continuous current dwells between 100-150 ms. In normal conditions, there is a complete beginning phase, extreme active phase and the ultimate phase in IC lightning flashes, the corresponding recoil the negative streamer process of K process is usually added to J process which changes slowly in the electric ground of hundreds of milliseconds.

关 键 词：成都地区 雷电物理 地闪 云闪 

分 类 号：P401[天文地球—大气物理学与大气环境]