Collaborative Research: CEDAR: Identifying Sources of Mid-latitude Traveling Ionospheric Disturbances

合作研究：CEDAR：识别中纬度移动电离层扰动的来源

• 批准号: 1452357
• 负责人: Asti Bhatt
• 金额: $ 29.32万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1452357&HistoricalAwards=false
• 关键词: Collaborative; Research; CEDAR; Identifying; Sources

Gravity waves (GWs) originating from lower atmospheric sources can lead to large accelerations of the background flow through wave dissipation or breaking. The accelerations produce secondary GWs with longer wavelengths, allowing them to propagate farther upward into the ionosphere. Here, through interaction with the ionospheric plasma, they are visible in the form of optical signatures in red line (630 nm) images, and are often referred to as traveling ionospheric disturbances (TIDs). A broad array of optical imagers will be used to triangulate the lower atmospheric sources for F region GWs, quantifying the GWs by numerically modeling the same optical signatures, and then using this quantification to ray-trace the secondary GWs to reveal their altitude profile of momentum deposition. This effort will connect two critical points on the coupled path: from the lower atmospheric source to momentum deposition in the mid to upper thermosphere. This project will include outreach to students at rural high schools where the instruments will be deployed. It will also provide undergraduate students opportunities to participate in data analysis and interpretation.

低层大气源产生的重力波(GWS)会通过波的消散或破裂导致背景流的大幅加速。这些加速产生了波长更长的次级GW，使它们能够进一步向上传播到电离层。在这里，通过与电离层等离子体的相互作用，它们在红线(630 Nm)图像中以光学信号的形式可见，通常被称为行进电离层扰动(TID)。一系列光学成像仪将被用来对F区GW的低大气源进行三角测量，通过对相同的光学特征进行数值模拟来量化GW，然后使用这种量化来光线跟踪次级GW，以揭示它们的动量沉积的高度分布。这一努力将连接耦合路径上的两个临界点：从低层大气源到中高层热层的动量沉积。该项目将包括对农村高中的学生进行外联，这些学生将在那里部署乐器。它还将为本科生提供参与数据分析和解释的机会。

项目成果

Multilayer Observations and Modeling of Thunderstorm‐Generated Gravity Waves Over the Midwestern United States

• DOI: 10.1029/2019gl085934
• 发表时间: 2019-12
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: C. Heale;J. Snively;A. Bhatt;L. Hoffmann;C. Stephan;E. Kendall