CEDAR: Studies of Tidal Variability and Planetary Wave Evolution Using Sequential Estimation Applied to Satellite and Radar Winds

热层-电离层-中间层能量学和动力学（TIMED）卫星上的测风仪器TIDI每天在50南纬和50北纬之间的4个不同的地方时间采集大约15个经度的样本。这种观测模式允许在几乎每天的基础上定义行星尺度的波浪和日潮汐。该项目的主要目标是吸收TIDI和雷达风，以便促进短期潮汐和行星波演变的研究。地面和卫星数据将使用顺序估计方法同化，选择这种技术是因为它有可能优化波的定义，保留动态意义的短期变化。波数0-5的潮汐和行星波系数将分发给TIMED/CEDAR社区。预计以易于理解的形式广泛获取数据将有助于促进与建模界的合作研究。拟议工作的结果有望最大限度地发挥地面和天基数据的潜力，以整理出源自中间层和低层热层（MLT）以下和内部的潮汐和行星尺度变化的全球尺度与局部尺度的原因。这些目标与CEDAR阶段3的目标是一致的，即将较低的层次耦合到MLT。

The wind-measuring instrument on the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite, TIDI, samples about 15 longitudes per day at 4 distinct local times between 50 S and 50 N. This observing pattern allows the definition of planetary-scale waves and diurnal tides on a near-daily basis. The leading objectives of this project are to assimilate TIDI and radar winds in order to facilitate studies of short-term tidal and planetary wave evolution. Ground-based and satellite data will be assimilated using the method of sequential estimation, a technique chosen because of its potential to optimize wave definitions that retain short-term variations of dynamical significance. Tidal and planetary wave coefficients for wavenumbers 0-5 will be disseminated to the TIMED/CEDAR community. It is expected that wide access to the data in an easily understood form will help to foster collaborative studies with the modelling community. The results of the proposed work are expected to maximize the potential of ground and space-based data to sort out the global-scale versus the local-scale causes of tidal and planetary scale variations that originate below and within the mesosphere and lower thermosphere (MLT). These goals are consistent with CEDAR Phase 3 objectives addressing coupling of the lower levels to the MLT.