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
基本信息
- 批准号:1840891
- 负责人:
- 金额:$ 44.61万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2019
- 资助国家:美国
- 起止时间:2019-06-01 至 2023-05-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
An outstanding question in space physics is how energy is transported throughout the near space environment. Radio waves at ultra-low frequencies (0.3-3 kHz) serve as both a transport mechanism for energy throughout the magnetosphere and ionosphere and an important diagnostic of the space plasma properties. This project creates a new physics-based model to better understand the dynamics of the near-Earth space environment. The broader impacts of this project include developing new models relevant to our understanding and prediction of space weather - a national priority set out in the National Space Weather Action Plan - and the training of a graduate student.Ultra-low-frequency (ULF) waves play a major role in the transport of energy in the near-Earth regions of the magnetosphere. The research will involve the development of a magnetohydrodynamic (MHD) wave code and its application to several problems involving ULF waves in the magnetosphere. The primary focus will be on the application of this model to problems in magnetoseismology, using these waves as a diagnostic of the plasma distribution throughout the magnetosphere. This can be accomplished both by a study of the properties of field line resonances as well as through the travel times of ULF waves from an impulsive source. While previous versions of the wave code have either been two-dimensional, or three-dimensional but with azimuthal symmetry, the code now allows for local time dependence of the ionosphere and plasmasphere. This allows for studies of the day-night differences in the ionosphere as well as the role of conductivity enhancements, such as in the auroral zone, or depletions, as can occur in the sub-auroral plasma trough. Including plasmaspheric asymmetry will allow for the dawn-dusk differences in the plasmasphere structure, including the possible presence of plasmaspheric plumes. Development and application of a global ULF wave model that can investigate these interactions is the primary goal of the research.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.
空间物理学中的一个突出问题是能量如何在整个近空间环境中传输。超低频(0.3-3千赫)无线电波既是能量在整个磁层和电离层的传输机制,也是空间等离子体特性的重要诊断手段。该项目创建了一个新的基于物理学的模型,以更好地了解近地空间环境的动态。该项目的更广泛影响包括开发与我们对空间气象的理解和预测相关的新模型-这是《国家空间气象行动计划》中规定的一个国家优先事项-以及培训一名研究生。这项研究将涉及磁流体动力学(MHD)波代码的发展及其应用到几个问题,涉及超低频波在磁层。主要的重点将是在磁震学的问题,使用这些波作为诊断的等离子体分布在整个磁层的应用程序。这可以通过研究场线共振的性质以及通过脉冲源的超低频波的传播时间来实现。虽然以前版本的波代码要么是二维的,要么是三维的,但具有方位角对称性,代码现在允许电离层和等离子体的本地时间依赖性。这使得可以研究电离层的昼夜差异以及电导率增强的作用,例如在极光区,或耗尽,如在亚极光等离子体槽中可能发生的。包括等离子体层的不对称性将允许等离子体层结构中的黎明和黄昏差异,包括可能存在的等离子体层羽流。该研究的主要目标是开发和应用全球ULF波模型,以调查这些相互作用。该奖项反映了NSF的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(4)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Statistical Analysis of Pi2 Pulsations Observed by Van Allen Probes
范艾伦探针观测到的 Pi2 脉动的统计分析
- DOI:10.1029/2022ja030674
- 发表时间:2022
- 期刊:
- 影响因子:0
- 作者:Takahashi, Kazue;Lysak, Robert;Vellante, Massimo
- 通讯作者:Vellante, Massimo
Field Line Resonances in Jupiter's Magnetosphere
木星磁层中的场线共振
- DOI:10.1029/2020gl089473
- 发表时间:2020
- 期刊:
- 影响因子:5.2
- 作者:Lysak, R. L.;Song, Y.
- 通讯作者:Song, Y.
Numerical Investigations of Interhemispheric Asymmetry due to Ionospheric Conductance
电离层电导引起的半球不对称的数值研究
- DOI:
- 发表时间:2020
- 期刊:
- 影响因子:0
- 作者:Lysak, R. L.;Song, Y.;Waters, C. L.;Sciffer, M. D.;Obana, Y.
- 通讯作者:Obana, Y.
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Robert Lysak其他文献
Storm time occurrence and spatial distribution of Pc4 poloidal ULF waves in the inner magnetosphere: A Van Allen Probes statistical study
内磁层中 Pc4 极向 ULF 波的风暴时间发生和空间分布:Van Allen Probes 统计研究
- DOI:
10.1002/2015ja021134 - 发表时间:
2015-06 - 期刊:
- 影响因子:0
- 作者:
Lei Dai;Kazue Takahashi;Robert Lysak;Chi Wang - 通讯作者:
Chi Wang
Robert Lysak的其他文献
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{{ truncateString('Robert Lysak', 18)}}的其他基金
GEM: Numerical Modeling of Ultra-Low-Frequency (ULF) Waves and the Production of Geomagntically Induced Currents
GEM:超低频 (ULF) 波的数值模拟和地磁感应电流的产生
- 批准号:
2225270 - 财政年份:2022
- 资助金额:
$ 44.61万 - 项目类别:
Standard Grant
Theory of Kinetic Alfven Waves and Auroral Particle Acceleration
运动阿尔文波和极光粒子加速理论
- 批准号:
1558134 - 财政年份:2016
- 资助金额:
$ 44.61万 - 项目类别:
Continuing Grant
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 - 财政年份:2014
- 资助金额:
$ 44.61万 - 项目类别:
Continuing Grant
Modeling Ultra-Low Frequency (ULF) Waves in the Near-Earth Magnetosphere
模拟近地磁层中的超低频 (ULF) 波
- 批准号:
1015310 - 财政年份:2010
- 资助金额:
$ 44.61万 - 项目类别:
Continuing Grant
Theory of Kinetic Alfven Waves on Auroral Field Lines
极光场线上的动力学阿尔芬波理论
- 批准号:
0903829 - 财政年份:2009
- 资助金额:
$ 44.61万 - 项目类别:
Standard Grant
GEM: Modeling of Magnetosphere-Ionsophere Coupling (MIC) at High and Mid-Latitudes
GEM:高纬度和中纬度磁层-电离层耦合 (MIC) 建模
- 批准号:
0602464 - 财政年份:2006
- 资助金额:
$ 44.61万 - 项目类别:
Continuing Grant
Theory of Kinetic Alfven Waves on Auroral Field Lines
极光场线上的动力学阿尔芬波理论
- 批准号:
0613473 - 财政年份:2006
- 资助金额:
$ 44.61万 - 项目类别:
Continuing Grant
GEM: Magnetosphere-Ionosphere Coupling--Theory and Modeling of Small-Scale Auroral Currents and Fields
GEM:磁层-电离层耦合——小尺度极光电流和场的理论和建模
- 批准号:
0201703 - 财政年份:2002
- 资助金额:
$ 44.61万 - 项目类别:
Continuing Grant
A Theoretical Study of Time-Dependent Magnetosphere Ionosphere Coupling
时变磁层电离层耦合的理论研究
- 批准号:
9301043 - 财政年份:1994
- 资助金额:
$ 44.61万 - 项目类别:
Continuing Grant
Theoretical Studies of Solar Wind-Magnetosphere-Ionosphere Coupling on Intermediate Scales
中尺度太阳风-磁层-电离层耦合的理论研究
- 批准号:
9115465 - 财政年份:1993
- 资助金额:
$ 44.61万 - 项目类别:
Continuing Grant
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