GEM: Modeling Ultra Low Frequency (ULF) Waves in the Near-Earth Magnetosphere

GEM：模拟近地磁层中的超低频 (ULF) 波

• 批准号: 1405383
• 负责人: Robert Lysak
• 金额: $ 45.56万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-07-01 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1405383&HistoricalAwards=false
• 关键词: GEM; Modeling; Ultra; Low; Frequency

Ultra low frequency (ULF) waves are important for the transport of energy in the near-Earth magnetosphere. This research will improve a MHD wave code and apply it to several problems involving ULF waves in the magnetosphere. The outcome will be a global ULF wave model that can address the specific science questions in this proposal and provide an approach that can be applied to many other problems in magnetospheric physics. Specifically the proposal will address three questions:1. The propagation and dynamics of ULF waves in the inner magnetosphere, to understand the dynamics of the Pi1 and Pi2 pulsations found at substorm onset and their timing at both high and mid-latitudes with respect to driving sources in the magnetotail.2. The use of ULF waves to determine the mass density of the magnetosphere through travel-time and field-line resonance ?magnetoseismology?. 3. The coupling of high and low-latitude wave fields through the propagation of MHD waves through the magnetosphere and of electromagnetic waves in the Earth-ionosphere waveguide. This research will support a graduate student. The wave model will be very useful in other magnetosphere-ionosphere coupling studies. This model provides a missing link in our global models of magnetosphere and ionosphere coupling and therefore is important for space weather. As result it has high societal value.

超低频（ULF）波对近地磁层中能量的运输很重要。 这项研究将改善MHD波代码，并将其应用于磁层中涉及ULF波的几个问题。 结果将是一个全球ULF波浪模型，可以解决本提案中的特定科学问题，并提供一种可以应用于磁层物理学中许多其他问题的方法。具体的提案将解决三个问题：1。内部磁层中ULF波的传播和动力学，以了解在Magnetailtail.2中，在高和中纬度的pi1和Pi2脉动的动力学及其在高和中纬度的时间上都存在。使用ULF波通过旅行时间和现场线共振来确定磁层的质量密度？ 3。通过MHD波通过磁层和地球层波导中电磁波传播的高纬度波场的耦合。这项研究将支持研究生。 波模型将在其他磁层 - 离子层耦合研究中非常有用。 该模型在我们的磁层和电离层耦合的全球模型中提供了缺少的链接，因此对于太空天气很重要。结果，它具有很高的社会价值。