在雷暴电场加速或减速作用下，到达探测器的宇宙线次级粒子强度、能量、时间和位置等将发生变化，这种来自地球大气层的新现象成了宇宙线物理和大气物理交叉学科中的研究热点。雷暴期间大气电场的变化异常剧烈，迄今尚未获得雷暴电场与宇宙线变化关联的清晰图像，雷暴电场加速宇宙线的物理机制还不全面。本项目依托高海拔宇宙线观测站(LHAASO)，研究雷暴电场的特征分布；分析LHAASO中Scaler模式数据和Shower模式重建数据，研究地面宇宙线和重建后原初宇宙线的强度变化，期望得到雷暴电场、闪电与宇宙线变化关联的完整图像；分析Shower模式原始数据，研究雷暴电场对簇射事例前峰面的影响，提高宇宙线原初方向的重建精度；结合Monte Carlo模拟，深入研究大气电场加速宇宙线以及宇宙线诱发闪电的物理机制。本项目的开展，还可为LHAASO中宇宙线相关的其他物理分析提供参考，并推动大气物理中相关课题的研究。

During thunderstorms, the charged particles in extensive air showers will be accelerated or decelerated. The intensity, energy, time and position of ground secondary cosmic ray could be influenced in strong atmospheric electric field. The new phenomenon originating in the terrestrial atmosphere during thunderstorms has been a hot topic in the interdisciplinary of cosmic ray and atmospheric physics. So far, the effect of thunderstorms electric field on the cosmic rays and a real understanding of the phenomena have not yet been achieved. Due to the advantage of large high altitude air shower observatory (LHAASO), the realistic thunderstorms electric field descriptions will be studied by analyzing the field data. To get the clearly relationship of the thunderstorms electric field, lighting and the cosmic rays, we plan to study the flux variations of reconstructed shower event by LHAASO in shower mode, and also the thunderstorm-related ground cosmic ray flux variations in Scaler mode. To improve the accuracy of the reconstructed shower’s direction, the raw data in shower mode will be analyzed. The effect of thunderstorms electric field on the shower front will be studied in detail, and more accurately method to reconstruct the primary shower event in LHAASO experiment will be provided. Monte Carlo simulations will be performed to study the acceleration mechanisms of secondary charged particles caused by an atmospheric electric field, and the process of lighting can be induced by cosmic rays. The study of this project will also provide important information in other cosmic ray studies with LHAASO，and be useful in the study of atmospheric physics.