Collaborative Research: CEDAR--Midnight Temperature Maximum and Its Impact on the Ionosphere-Thermosphere System

合作研究：CEDAR——午夜最高温度及其对电离层-热层系统的影响

• 批准号: 1552078
• 负责人: Tzu-Wei Fang
• 金额: $ 22.53万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1552078&HistoricalAwards=false
• 关键词: Collaborative; Research; CEDAR; Midnight; Temperature

In this project, phenomena in the thermosphere and ionosphere will be studied combining the analysis of observations and modeling. The midnight temperature maximum (MTM) in the thermosphere and related ionospheric phenomena have been observed by multiple instruments but have not been successfully simulated by a physics-based model. This study will improve our knowledge of dynamical and electrodynamical processes in the ionosphere at low latitudes. It will also serve to validate and improve the climatology of wind velocity, neutral temperature, electron density, and electric fields in the whole atmosphere model (WAM). This model will be transitioned into operation for upper atmosphere forecasting and space weather prediction in the near future. A summer student participating in the project will gain experience in data analysis of observations and basic physics of the upper atmosphere.The WAM is the first comprehensive model that is able to internally generate an MTM of a realistic magnitude. Through simulations using the fully coupled WAM and global ionosphere and plasmasphere model (GIP), this study aims to gain a better understanding of the climatology and morphology of MTM and to investigate its impact on the nighttime ionosphere-thermosphere system. Simulations will provide useful information on MTM in order to interpret the various observations. Multiple ground-based and satellite measurements will be analyzed to infer the longitudinal, latitudinal, seasonal, and solar-cycle variations of MTM and compared with simulation results. Furthermore, ion-neutral coupling between the thermosphere and ionosphere at nighttime will also be investigated.

在该项目中，将结合观测分析和建模研究热层和电离层中的现象。热层午夜最高温度和相关的电离层现象已被多种仪器观测到，但尚未成功地被基于物理学的模型模拟。这项研究将增进我们对低纬度电离层动力学和电动学过程的了解。它还将用于验证和改进全大气模式（WAM）中风速、中性温度、电子密度和电场的气候学。该模型将在不久的将来投入运行，用于高层大气预报和空间天气预报。参加该项目的暑期学生将获得观测数据分析和高层大气基本物理学方面的经验。WAM是第一个能够在内部生成现实量级MTM的综合模式。通过使用完全耦合的WAM和全球电离层和等离子体模型（GIP）的模拟，这项研究的目的是获得更好的了解MTM的气候和形态，并调查其对夜间电离层-热层系统的影响。模拟将提供有关MTM的有用信息，以便解释各种观测结果。多个地面和卫星测量将进行分析，以推断的纵向，纬度，季节和太阳周期变化的MTM和模拟结果进行比较。此外，还将研究夜间热层和电离层之间的离子中性耦合。