雷暴电场对宇宙线次级粒子中电子的影响  

Effects of Thunderstorms Electric Field on Intensity of Cosmic Ray Electrons

作　　者：周勋秀[1] 王新建[1] 黄代绘[1] 贾焕玉[1] 

机构地区：[1]西南交通大学物理科学与技术学院,成都610031

出　　处：《空间科学学报》2016年第1期49-55,共7页Chinese Journal of Space Science

基　　金：国家自然科学基金项目(11175147;11475141);中央高校基本科研业务经费专项资金项目(2682014CX091)共同资助

摘　　要：雷暴期间宇宙线次级粒子强度变化与大气电场的关联研究,对分析大气电场加速宇宙线次级带电粒子的机制具有重要意义.采用Monte Carlo方法,模拟研究了雷暴电场对宇宙线次级粒子中电子强度的影响.结果显示,在强度为1000V·cm^(-1)的雷暴电场中,高海拔处电子数目呈指数增长,在大气深度约300g·cm^(-2)处达到极大值,与以往研究提出的相对论电子逃逸雪崩机制相符.模拟结果表明,在地面宇宙线观测实验中,要想得到明显的观测效应,雷暴电场距离探测面的高度应<600 m,电场厚度应达到约2000 m.模拟结果为分析雷暴电场与地面宇宙线次级粒子中电子强度的关联性提供了重要参考,为进一步模拟研究雷暴期间高山地面宇宙线强度的变化提供了重要信息.Correlation study on the intensity change of the cosmic rays and the thunderstorms electric field is very important in understanding the acceleration mechanism of secondary charged particles caused by electric field. In this paper, Monte Carlo simulations were performed to study the effects of the thunderstorms electric field on the electrons in extensive air showers. High up in the atmosphere, the number of electrons increased exponentially in a field of 1000V.cm-1. And at an atmospheric depth about 300g.cm-2, the electrons reached a maximum. These results were consistent with the theory of Relativistic Runaway Electron Avalanche （RREA）. The simulations also indicated that in order to obtain a clearly observable effect in the ground experiments, the thunderstorms electric field should be located not higher than 600m above the detector and the length of the electric field should be about 2000m. These preliminary results are helpful to understand the correlation between the thunderstorms electric field and the electron intensity of ground cosmic rays, and provide important information to further study of the effects on secondary cosmic ray particles in thunderstorms electric field.

关 键 词：雷暴电场 宇宙线 MONTE CARLO模拟 

分 类 号：P353[天文地球—空间物理学]