Study of the Instantaneous Change of Secondary Cosmic Ray During Thunderstorm

Coincident study on the Atmospheric Electric Field (AEF) change and EAS particle increase during thunderstorm is very important in understanding the acceleration of secondary cosmic rays particle caused by AEF. From April to August, 2006, thunderstorms were frequently recorded at Yangbajing Cosmic Ray Observatory. This work analyzed the correlation between AEF and scaler mode counting rate during thunderstorm when the AEF has violent change. The results revealed that the counting rate of four channels had different feedback on the violent change of AEF, which showed that their energy and most components were different. In general, counting rate in channels of n=1, 2 are found to have large increase varying from 1% to 9%, while there was less or no significant changes for channels of n=3, n≥ 4. These preliminary results were very important to the further study of the acceleration mechanism of secondary cosmic rays.