摘要
利用西藏那曲无狭缝光栅摄谱仪获得的一次多回击云对地闪电光谱,研究了各放电通道的温度及其变化。结果表明,一次闪电不同回击过程的通道温度有明显差异,闪电前期的温度通常较高,之后呈逐渐降低趋势。将闪电光谱与同步电学观测资料相结合,讨论了光谱特征、通道温度与闪电放电特性、电流热效应的相关性。数据分析显示,光谱总强度与辐射电场的变化幅度成正比;光谱总强度与放电电流的大小成正比;通道温度与回击过程传输的能量为正相关。
Using the spectrum of cloud-to-ground（CG） lightning with multiple return strokes obtained by a slit-less spectrograph in Tibetan Plateau,the channel temperature and its change have been studied.The results show that the channel temperature oppears obvious difference in different strokes of lightning.Generally,the temperature at initial stage of flash is higher,and then gradually decreases.The spectral characteristic,channel temperature and their correlation with discharge characteristic and the thermal effect of current are discussed by combing the spectrum with synchronous electrical information at the first time.It is found that the total intensity of spectrum is directly proportional to the amplitude variations of radiation electric field,the total intensity of spectrum should bedirectly proportional to the intensity of discharge current,and the correlation between channel temperature and the energy transmitted in one return stroke is positive.
出处
《高原气象》
CSCD
北大核心
2012年第1期218-222,共5页
Plateau Meteorology
基金
西北师范大学科技创新工程项目(NWNU-KJCXGC-03-21)资助
关键词
多回击地闪
光谱
通道温度
同步电学观测
Multi-return stroke of cloud-to-ground lightning Spectrum Channel temperature Synchronous electrical observation
