地球中间层顶附近（80-120km）区域是地球中性大气向空间等离子的过渡区，容易受到低层大气各种波动的影响，状态变化剧烈，是中高层大气研究的热点区域。流星物质注入地球大气后，在中间层顶区域与大气相互作用，通过摩擦产生等离子尾迹；当流星物质烧蚀后的离子、原子通过与中高层大气的光化学作用，在中间层顶区域形成永久的金属原子/离子层。流星尾迹等离子尾迹和其形成的金属层，可以示踪中间层顶区域动力学和光化学过程，是研究该区域大气耦合的有效手段。基于此，本项目的目标：（1）通过流星等离子体尾迹的双极扩散效应，有效获取中间层顶区域的中性大气温度、密度，从而拓展流星雷达（目前流星雷达主要用于观测风场）的探测参数；（2）基于流星雷达、激光雷达获取的中间层顶区域大气关键参数，结合再分析数据和模式，研究中间层顶区域大气状态与低层大气耦合过程。

The mesopause and lower thermosphere region is a transition region from the neutral atmosphere to the space plasma, which can be affected by the upward propagating waves from the lower atmosphere and is a Hot-spot in the upper atmospheric research. As the meteors down into the Earth’s atmosphere, they interact with the atmospheric molecules and generate the trail of plasma; on the other hand, the ions or atoms vapored from the meteors form a permanent metal layers through the photo-chemical reactions. The ground-based remote-sensing techniques can obtain the information of the atmospheric paramters in the mesopause and lower thermosphere region through the measuring the plasma in the meteor trails or metal ions/atoms layers. Based on the ground-based radio and optical observations, the aims of the project are: (1) improving the retrieval methods for the mesospheric temperature and density based on the meteor radar detection; (2) studying the coupling processes between the mesopause and lower thermosphere and lower atmosphere based on the lidar/radar detections as well as the re-analysis data and models.