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

CEDAR：基于综合观测数据库开发全球低热层潮汐经验模型

• 批准号: 9102115
• 负责人: Roberta Johnson
• 金额: $ 10.52万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1994-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9102115&HistoricalAwards=false
• 关键词: CEDAR; Development; Global; Empirical; Model

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. *** '

这项赠款支持较低的综合数据库 热层测量风，温度，密度， 由卫星、火箭和地基雷达组成， 光学仪器. 这些数据将用于开发和测试 全球低热层日变化的经验模式， 85 - 150 km的半日潮振荡。 分析 该套资料将包括各年的气候平均值， 不同的地理位置基于太阳周期和 适当的地磁活动。 傅立叶分解 气候平均值将产生周日和半日 组件在选定的海拔高度，最后分解 作为纬度函数的傅立叶分量将允许 振幅和相位的贡献霍夫函数潮汐 模式有待确定。 气候平均值和Hough模式 函数振幅和相位将以方便的方式进行组装， 格式分发给感兴趣的科学家。 所得 低热层日变化和 半日潮将被用于几个科学的 调查事务所 气候潮汐振荡将是 与以前的理论和 半经验模型 其他研究将包括调查 电离层的电动强迫产生的 推算的全球低热层潮汐和一个长期分析 利用低层热层的潮汐动量强迫 国家大气研究中心（NCAR）热层 电离层环流模式（TIGCM）及其诊断 处理器. *** '