回击电流及热效应与闪电光谱和通道温度的相关性分析

摘要

The spectrum of cloud-to-ground lightning flashes with two-multiple return strokes have been obtained in the Qinghai Plat-eau by using a slitless spectrograph,the channel temperatures,the total intensity of spectrum,the peak value of current and its action in-tegral have been calculated combining the information of synchronous radiated electric field.According to the observation results and anal-ysis on them,the conclusions are as follows:(1 )The total intensity of spectra has a positive correlation with the discharge current in dif-ferent strokes of one cloud-to -ground lightning.(2)During the lightning process,if the time interval between two adjacent return strokes is relatively long,the temperature and action integral of current are close to positive correlation.Whereas if the time interval be-tween two adjacent return strokes is relatively short,the temperature and action integral had non-linear correlation each other.%依据在青海地区由无狭缝光栅摄谱仪获得的2次多回击云对地闪电的光谱，结合同步辐射电场变化资料，计算了放电等离子体的温度、光谱总强度以及回击通道的峰值电流和作用积分。对观测结果和这些参数进行对比分析，结果表明：（1）同一次地闪的不同回击过程中，光谱总强度与放电电流的大小呈正相关；（2）相邻2次回击的时间间隔较长时，等离子体通道的温度与电流作用积分基本成正比；当相邻2次回击的时间间隔较短时，通道温度与作用积分不再线性相关。