电离层和中高层大气空间范围交叉，带电成分与中性大气共同经历着复杂的化学和动力学过程，进行成分和能量的输运与反馈。深入理解中性大气-电离层耦合机制对于完善日地系统空间天气耦合链至关重要。流星烧蚀在80-200km释放的金属原子是中性大气-电离层耦合机制研究很好的示踪物。由于电离成分和中性成分观测资料的时空分辨率不一致、电离成分与中性成分之间涉及的化学过程复杂等原因，目前对于金属层顶部和底部特性以及中性大气-电离层的耦合机制还很模糊。本项目拟以激光雷达的钙原子和钙离子同时同地观测数据，结合测高仪、流星雷达、磁力仪、SABER卫星等多重观测数据及钙层模型，通过研究金属层顶部促进离子中性化的因素和金属层底部频繁出现钙离子的原因，完善90km之下和105km之上的突发钙原子层的形成机制，深入理解高空中性成分和电离成分的耦合关系，为未来空间天气的监测、建模、预报服务提供理论依据。

The ionosphere and the middle and upper atmosphere cross in same altitude, and the charged components together with the neutral atmosphere undergo complex chemical, thermodynamic and kinetic processes for the transport and feedback of components, momentum and energy. An in-depth understanding of the atmospheric-ionospheric coupling mechanism is essential for a better interpretation of observed atmospheric phenomena, an understanding of the Earth's climate system, the development of forecasting capabilities and the improvement of the spatial weather coupling chain of the solar-terrestrial system. The metal atoms of meteor ablated at 80-200 km are good tracers for the study of neutral atmosphere-ionosphere coupling mechanism. At present, the coupling relationship between the sporadic metal atomic layer and the sporadic E layer of the ionosphere between 90 km to 105 km has been developed. The coupling of neutral atmosphere-ionosphere at the top and bottom of the metal layer is still very vague due to the inconsistent spatial and temporal resolution of the ionosphere and neutral atmosphere observation data and the complex chemical processes between the ion and the neutral component. This project will study the coupling relationship between neutral and ionized components at upper atmosphere through studying the formation mechanism of sporadic calcium atomic layer under 90 km and above 105 km combining multiple observation data such as lidar, meteor radar, Overhaose magnetometer, SABER satellite and calcium layer model. And this project will provide theoretical basis for future space weather monitoring, modeling and forecasting services.