Theoretical and Experimental Studies of Auroral Farley-Buneman Waves

极光法利-布尼曼波的理论与实验研究

基本信息

批准号：
1818216
负责人：
David Hysell
金额：
$ 48.26万
依托单位：
Cornell University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-08-15 至 2024-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1818216&HistoricalAwards=false
关键词：
Theoretical Experimental Studies Auroral Farley

项目摘要

Farley-Buneman (FB) wave instability is triggered in a partially ionized plasma when a cross-field drift of electrons relative to ions exceeds a critical threshold value. This phenomenon substantially modifies current flows, and thus affects the response of the entire Magnetosphere-Ionosphere (MI) system, primarily during storm-time. FB waves also produce strong radar echoes, and these allow monitoring of the MI system. The original theory of FB waves is based on linear, local fluid theory that does not account for many observed aspects of the waves. The results of the work would improve understanding of MI coupling not only though the modification of models of this coupling, but also through the diagnostic use of the radar echoes produced by FB waves. The project will fund a graduate student and engage Master's and undergraduate students in space research.The Principal Investigators (PIs) will synthesize improved theory, nonlinear numerical simulation, and numerous disparate observations, including measurements from the High Frequency Active Auroral Research Program (HAARP) heater. The project will implement a new approach to radar imaging using "compressive sensing." This technique has been transformative in other fields, and is seen as potentially beneficial to the Coupling, Energetics and Dynamics of Atmospheric Regions (CEDAR) radio science community.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

当电子相对于离子的跨场漂移超过临界阈值时，Farley-Buneman（FB）波不稳定性在部分离子化的血浆中触发。这种现象基本上改变了电流的流动，因此主要在暴风雨时间期间影响了整个磁层 - 离子层（MI）系统的响应。 FB波还会产生强烈的雷达回波，并且可以监测MI系统。 FB波的原始理论基于线性的局部流体理论，该理论并未解释波浪的许多方面。工作的结果将不仅可以通过诊断使用FB波产生的雷达回声来改善对MI耦合的理解。该项目将为研究生提供资金，并让硕士和本科生参与太空研究。该项目将使用“压缩传感”实施一种新的方法来进行雷达成像。该技术在其他领域具有变革性，被认为对大气区域的耦合，能量和动态（CEDAR）无线电科学社区有益。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的审查标准来通过评估来通过评估来支持的。