Collaborative Research: GEM--Comparing Simulations of Electron Acceleration in Kinetic Alfven Waves with Observations from the Van Allen Probes in the Inner Magnetosphere

合作研究:GEM——将阿尔文运动波中的电子加速模拟与内磁层范艾伦探测器的观测结果进行比较

基本信息

  • 批准号:
    1602941
  • 负责人:
  • 金额:
    $ 9.62万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2017
  • 资助国家:
    美国
  • 起止时间:
    2017-08-15 至 2021-07-31
  • 项目状态:
    已结题

项目摘要

The focus of this project is study a class of waves known as kinetic Alfven waves (KAWs) that may play an important role in the formation of the aurora. New observations from the Van Allen Probes mission show that these waves are a common during space weather storms. Interactions between these KAWs and electrons can result in penetration of these electrons into the atmosphere. Their penetration into the upper atmosphere leads to changes into electrical characteristics of the upper atmosphere. Understanding the factors that control the electrical properties of the upper atmosphere is essential to producing better space weather forecasts. The project will use a combination of numerical models and observations to investigate the process that transfers energy from the KAWs to the electrons. Undergraduate and graduate students will actively participate in this project. The investigators will also plan to provide opportunities for undergraduates to participate in the research through partnership with National Undergraduate Fellowship Program in Plasma Physics and Fusion Energy Sciences program.The proposers will use a hybrid Gyrofluid-Kinetic-Electron (GKE) model to study the recently observed traveling and standing Alfven waves prevalent through the inner magnetosphere during substorms. Van Allen probes data will be used to derive simulation parameters and compare with simulation output. This investigation will determine how and to what extent KAW energy flux is converted to electron energy flux in the inner magnetosphere. It will determine to what extent this mechanism is an efficient and effective pathway for enhanced energization and scattering of plasmasheet electrons into the loss cone, for additional heating of the ionosphere due to this scattering and for additional Poynting flux into the ionosphere.
该项目的重点是研究一类被称为动力学阿尔芬波(KAWS)的波,它可能在极光的形成中发挥重要作用。来自范艾伦探测器任务的新观测表明,这些波在太空天气风暴期间是常见的。这些KAW与电子之间的相互作用可能导致这些电子穿透到大气中。它们对高层大气的穿透导致高层大气的电特性发生变化。了解控制高层大气电学特性的因素对于制作更好的空间天气预报至关重要。该项目将使用数值模型和观测相结合的方法来研究从KAWS到电子的能量转移过程。本科生和研究生将积极参与这一项目。研究人员还计划通过与国家等离子体物理和聚变能源科学本科生奖学金计划合作,为本科生提供参与研究的机会。提出者将使用陀螺流体-动力学-电子(GKE)混合模型来研究最近观测到的亚暴期间在内磁层中普遍存在的行波和驻波。范艾伦探测器的数据将被用来推导仿真参数并与仿真输出进行比较。这项研究将确定KAW能通量如何以及在多大程度上转化为内磁层中的电子能通量。它将确定这一机制在多大程度上是一种有效和有效的途径,可增强等离子体片电子向损耗锥体的激发和散射,增加这种散射引起的电离层加热,并增加进入电离层的Poynting通量。

项目成果

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Christopher Chaston其他文献

Christopher Chaston的其他文献

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{{ truncateString('Christopher Chaston', 18)}}的其他基金

Rapid Radiation Belt Scattering in Electromagnetic Turbulence
电磁湍流中的快速辐射带散射
  • 批准号:
    2041971
  • 财政年份:
    2021
  • 资助金额:
    $ 9.62万
  • 项目类别:
    Standard Grant
Turbulent Ion Heating in the Magnetosheath
磁鞘中的湍流离子加热
  • 批准号:
    1536738
  • 财政年份:
    2016
  • 资助金额:
    $ 9.62万
  • 项目类别:
    Continuing Grant
Thin Current Sheets and the Evolution of Auroral Forms
薄电流片和极光形式的演变
  • 批准号:
    1102514
  • 财政年份:
    2011
  • 资助金额:
    $ 9.62万
  • 项目类别:
    Continuing Grant
GEM: Source Processes for Dispersive Shear Alfven Waves
GEM:色散剪切阿尔文波的源过程
  • 批准号:
    0602728
  • 财政年份:
    2006
  • 资助金额:
    $ 9.62万
  • 项目类别:
    Continuing Grant
Space Plasma Transport by Kinetic Alfven Waves
阿尔文运动波的空间等离子体传输
  • 批准号:
    0612614
  • 财政年份:
    2006
  • 资助金额:
    $ 9.62万
  • 项目类别:
    Continuing Grant

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Collaborative Research: GEM: Propagation and Dissipation of Electromagnetic Ion Cyclotron Waves in the Magnetosphere and Ionosphere
合作研究:GEM:磁层和电离层中电磁离子回旋波的传播和耗散
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  • 批准号:
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