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

该拨款支持来自卫星、火箭、地面雷达和光学仪器的低热层风、温度、密度和成分测量的综合数据库。这些数据将用于开发和测试85至150公里范围内全球低层热层日和半日潮汐振荡的经验模型。对数据集的分析将包括在适当情况下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。气候平均值的傅里叶分解将在选定的高度产生日和半日分量，最后将傅里叶分量分解为纬度的函数，将允许确定贡献霍夫函数潮汐模式的振幅和相位。气候平均值和模式霍夫函数振幅和相位将以方便的格式汇编，以便分发给感兴趣的科学家。所得到的低层热层日潮和半日潮的模式表示将用于若干科学研究。气候潮汐振荡将与以前的理论和半经验模式的结果进行比较。其他研究将包括研究由推断的全球低热层潮汐引起的电离层电动力强迫，以及利用国家大气研究中心（NCAR）的热层电离层环流模式（TIGCM）及其诊断处理器对低热层的潮汐动量强迫进行长期分析。*** '

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. *** '