Collaborative observations of atmospheric waves and constituent variations in the MLT region using ground-based observation network in Japan and America with satellite observations.

该项目的目标是通过地面使用日本、美国和巴西的无线电和光学观测以及卫星观测来阐明中间层低热层(MLT)区域各种时空尺度的变化，特别是大气波及其相关成分变化的变化。通过在Shigaraki MU雷达站的协调观测，揭示了大气重力波与气辉发射廓线变化的关系。美国科罗拉多州开发了一台新的OH全天成像仪，并与钠激光雷达和两台成像仪进行了协调观测(CO2成像仪运动)。阐明了气辉图像中的波纹结构与大气稳定性之间的关系，通过在日本、美国和巴西的气辉成像观测和射线追踪，发现了MLT地区对流层扰动与重力波之间的联系。利用雷达、卫星观测和GCM模式对非迁移性潮汐进行了研究，提出了气辉图像特征的纬向变异性。三维模拟明确了大气中破碎的重力波和波纹结构。如上所述，该项目的结果不仅限于协调观测的简单输出，而且扩展到更广泛的研究区域，这将进一步促进日本、美国和巴西未来在高层大气区域的合作。

The goal of this project is to clarify various spatial and temporal scales of variations, especially variations of atmospheric waves and associated constituent variations, in the mesosphere lower thermosphere (MLT) region by ground-based using radio and optical observation in the Japan, USA and Brazil as well as satellite observations.From coordinated observations at Shigaraki MU radar site, relations between atmospheric gravity waves and variations of airglow emission profiles have been revealed. A new OH all-sky imager has been developed and coordinated observations with a sodium lidar and two imagers have been carried out (CO2 imager campaign) in Colorado, USA. Relations between ripple structures in the airglow image and atmospheric stability have been clarified.Associations between troposheric disturbance and gravity waves in the MLT region have been found by observations and ray-tracing using airglow imaging observations in Japan, USA and Brazil. Effect of atmospheric tides are also discussed.Non-migrating tides has been studied using radar, satellite observations and a GCM model, and zonal variability of airglow image characteristics has been suggested. Three-dimensional simulation has clarified breaking gravity waves and ripple structures in the airglow.As mentioned above, the results of this project is not limited to the simple output of coordinated observations and spread over a wider research region, which would further stimulate future collaboration between Japan, USA and Brazil in the upper atmosphere region.