CEDAR: Development of a Global Empirical Model of Lower Thermospheric Tides Based on a Comprehensive Observational Data Base

这笔赠款支持卫星、火箭以及地面雷达和光学仪器对低热层的风、温度、密度和组成进行测量的综合数据库。这些数据将用于开发和检验全球低热层从85公里到150公里的昼夜和半日潮汐振荡的经验模式。对数据集的分析将包括酌情根据太阳周期和地磁活动形成不同地理位置的气候平均值。对气候平均值的傅里叶分解将产生选定高度的日和半日分量，最后，傅立叶分量作为纬度的函数的分解将允许确定贡献霍夫函数潮汐模式的幅度和相位。气候平均值和模型霍夫函数的幅度和相位将以方便的格式汇编在一起，分发给感兴趣的科学家。由此产生的低热层全日和半日潮汐的模型表示将用于几项科学调查。气候学潮汐振荡将与以前的理论和半经验模型的结果进行比较。其他研究将包括利用国家大气研究中心(NCAR)热层电离层一般环流模式(TIGCM)及其诊断处理器对所推导的全球低热层潮汐引起的电离层电动力强迫进行调查，并对低热层中的潮汐动量强迫进行项分析。*‘

This grants supports the comprehensive data base of lower thermospheric measurements of winds, temperatures, densities, and composition from satellites, rockets, and ground-based radar and optical instruments. These data will be used to develop and test an empirical model of global lower thermospheric diurnal and semidiurnal tidal oscillations from 85 to 150 km. Analysis of the data set will include formation of climatological averages at different geographic locations based on solar cycle and geomagnetic activity where appropriate. Fourier decomposition of the climatological averages will yield diurnal and semidiurnal components at selected altitudes, and finally decomposition of the Fourier component as a function of latitude will allow amplitudes, and phase of the contributing Hough function tidal modes to be determined. Climatological averages and model Hough function amplitudes and phases will be assembled in convenient format for distribution to interested scientists. The resulting model representations of lower thermospheric diurnal and semidiurnal tides will be used in several scientific investigations. Climatological tidal oscillations will be compared with the results of previous theoretical and semiempirical models. Other studies will include investigation of the electrodynamic forcing of the ionosphere arising from the deduced global lower-thermosphere tides and a term analysis of the tidal momentum forcing in the lower thermosphere utilizing the National Center for Atmosphere Research (NCAR) Thermosphere Ionosphere General Circulation Model (TIGCM) and its diagnostic processors. *** '