“伴生闪电”（Associated lightning discharges）是雷暴中普遍存在的闪电放电活动伴生现象，其时空分布规律及伴生机制受到广泛关注。本项目拟在内陆高原地区，利用闪电VHF辐射源三维定位系统及配套设备，开展对雷暴中电学活动的观测，获取完整的雷暴电学活动三维定位、地面电场及空中电场等数据。建立基于双电学活动单元的数学物理模型，拟定合理的时空间隔鉴别标准，识别伴生闪电并分析其时空分布规律。结合雷达回波、电场及电场变化等分析，反演雷暴电荷结构及演变过程，分析其在伴生闪电形成中的作用。并在闪电放电过程中电荷中和、输送、沉积等分析基础上，对不同类型伴生闪电中首次放电活动对继后电学活动抑制、诱发、甚或触发作用的物理机制进行研究。研究结果不仅可促进对伴生闪电时空分布特征、伴生机制的深入认识，深化雷暴电学活动宏观规律研究，也进一步为大气电学研究提供重要观测事实，具有十分重要的科学价值

Associated lightning discharges are associated phenomenon of lightning discharges activity and may be widespread in thunderstorm. And their interaction mechanism and characteristic of space-time distribution are followed closely by researcher. Using a lightning mapping system and auxiliary equipment, the experimental observation of lightning discharges would be carried out in inland plateau in this project. The uninterrupted three-dimensional location data, electric field data on sounding balloon and electric field on ground of lightning discharges would be caught. To establish the mathematical physics model based on dual electrically active cells (EACs), and associated lighting discharges would be discerned with a criterion of space time interval, and their space time distribution would be analyzed in thunderstorm. Combined the analysis of radar echo, electric field and electric field change and so on, the electrical structure of thunderstorm and its evolution would be inferred, and its action on forming period of associated lightning discharges would be analyzed. Further, basing on anlysis of charge neutralization, charge transport and charge sediment, the different kinds of associated lightning discharges and their interaction mechanism would be studied. This work would improve understanding to space-time distribution of associated lightning discharges in thunderstorm and their interaction mechanism, and could deepen research on macro regularity of thunderstorm electrical activity, and could provide important observation fact on atmospheric electricity. It has important scientific value.