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TIDI上的风测量仪在南纬50度至北纬50度之间的4个不同的当地时间每天采集约15个风速。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和昼夜潮汐。该项目的主要目标是同化TIDI和雷达风，以促进短期潮汐和行星波演变的研究。将使用顺序估计法对地面和卫星数据进行同化，之所以选择这一技术，是因为它有可能优化保留具有动力学意义的短期变化的波浪定义。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。预计拟议工作的结果将最大限度地发挥地基和天基数据的潜力，以查明源自中间层和低热层之下和之内的潮汐和行星尺度变化的全球尺度和地方尺度原因。这些目标与CEDAR III期目标一致，该目标涉及较低水平与MLT的偶联。

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.