一次闪电回击过程的通道辐射特性  

The Radiation Characteristic of a Lightning Return Stroke Channel

作　　者：张华明[1] 袁萍[1] 吕世华[2] 欧阳玉花[1] 

机构地区：[1]西北师范大学物理与电子工程学院 [2]中国科学院寒区旱区环境与工程研究所西部气候环境与灾害实验室,甘肃兰州730000

出　　处：《高原气象》2008年第1期143-147,共5页Plateau Meteorology

基　　金：国家自然科学基金项目(40475007)资助

摘　　要：用无狭缝摄谱仪获得了山东省一次云对地闪电回击过程的光谱,根据光谱信息,计算了闪电通道等离子体温度和电子密度,并分析了闪电通道内部的辐射机制,讨论了闪电通道等离子体中的箍缩效应。由此推断:闪电通道等离子体中的箍缩效应是闪电产生X射线的主要辐射源。最后讨论了闪电通道与激光在大气中激发的等离子体通道的差异。Spectra of lightning return strokes had been obtained by Slit less spectrograph in Shandong. Channel temperature and electron density are calculated according to the information of lightning - spectra. The radiation mechanism of lighting channel is analyzed. Pinch effect of lightning channel plasma is discussed, and from this pinch spot is deduced as the main radiant point of X-ray in the process of light ing. The differences between lightning channel and plasma channel produced by laser in the atmosphere is discussed.

关 键 词：箍缩效应 通道温度 电子密度 

分 类 号：P427.39[天文地球—大气科学及气象学]