ULF Waves and inner-magnetosphere wave-particle interactions: modelling satellite and ground-based observations

ULF 波和磁层内波粒相互作用：模拟卫星和地面观测

• 批准号: RGPIN-2015-06569
• 负责人: Rankin, Robert
• 金额: $ 3.06万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=762560
• 关键词: ULF; Waves; inner; magnetosphere; wave

The primary objective is to use data from high profile Canadian and international satellite missions to constrain and validate advanced computer models that predict space weather resulting from a global distribution of ultra low frequency (ULF) plasma waves in Earth's magnetosphere. These waves are particularly intense in the recovery phase of geomagnetic storms and cause substantial atmospheric heating and ionization, ion outflows, and scattering of energetic particles to the atmosphere. This scattering represents a significant loss mechanism for Earth's radiation belts. Computer models will be developed to answer fundamental questions about particle acceleration in the inner magnetosphere and auroral zone, and about processes affecting the high latitude neutral atmosphere and ionosphere. The models will be used to interpret observations of ULF waves and charged particle precipitation made by Canadian ground-based arrays of magnetometers, optical and particle imagers, HF-radar, and VLF and GPS receivers.   The expected outcome is new modelling capabilities to assess how ULF waves drive space weather affecting satellites, power grids, and astronauts working in regions of space exposed to solar radiation. The methodology involves development of simulation codes that solve complex systems of physical equations describing plasma wave propagation through the magnetosphere, ionosphere, and neutral atmosphere, pitch-angle diffusion, and drift- and drift-bounce-resonance wave-particle interactions. The development of a global wave model coupled with a realistic time-dependent ionosphere and neutral atmosphere will facilitate remote sensing of cold plasma dynamics affecting acceleration and loss in the radiation belts. This model, along with other models, will be used to predict global properties of ULF waves that are excited externally by the direct action of the solar wind, and internally as a result of inner magnetosphere plasma instabilities. The models will also be used to understand how ULF waves couple with the ionosphere via geomagnetic field-aligned currents and time-dependent Hall and Pedersen currents. Higher frequency whistler and kinetic scale Alfven waves that scatter and accelerate charged particles into the auroral zone will also be investigated. These studies will make use of previously developed kinetic Vlasov and ray-tracing simulation models. The proposed studies on ULF waves are aligned with objectives of the NASA Van Allan Probes and THEMIS missions, and the Canadian Enhanced Polar Outflow Probe and European SWARM missions. They are also aligned with the new Canadian Space Agency ground-based GO-Canada program. A secondary objective is to utilize experience developing plasma simulation codes to understand solar wind interactions with the Moon and comets. Training that is planned is intended to attract and inspire a new generation of space scientists.

主要目的是使用来自加拿大和国际卫星任务的备受瞩目的数据来限制和验证高级计算机模型，以预测地球磁层中超低频（ULF）等离子体波的全球分布产生的空间天气。这些波在地磁风暴的恢复阶段尤其亲密，导致大气加热和电离，离子出口以及能量颗粒散射到大气中。这种散射代表了地球辐射带的重要损失机制。将开发计算机模型来回答有关内部磁层和极光区域粒子加速度的基本问题，以及影响高纬度中性气氛和电离层的过程。这些模型将用于解释由加拿大磁力计，光学和粒子图像，HF-radar以及VLF和GPS接收器制成的ULF波和带电的颗粒沉淀的观察结果。预期的结果是新的建模能力，以评估ULF波如何驱动空间天气影响卫星，电网和在暴露于太阳辐射的空间区域工作的宇航员。该方法涉及开发仿真代码，该代码求解了描述血浆波传播的复杂系统，这些系统通过磁层，电离层和中性气氛，俯仰角扩散以及漂移和漂移弹力共振波 - 粒子相互作用。全局波模型的发展以及现实的时间依赖性电离层和中性气氛的发展将促进感冒等离子体动力学的遥远灵敏度，从而影响辐射带的加速度和损失。该模型以及其他模型将用于预测ULF波的全局性质，这些模型由太阳风的直接作用以及内部磁层等离子体的不稳定性在外部激发。这些模型还将用于了解ULF Waves如何通过地磁场对准电流以及时间依赖性的霍尔和Pedersen电流如何与电离层夫妇。还将研究较高的较高的鞭子和动力学刻度的Alfven波，这些Alfven波还将研究散射和加速带电的颗粒进入极光区。这些研究将利用先前开发的动力学vlasov和射线追踪模拟模型。提出的关于ULF波的研究与NASA Van Allan探针和Themis任务的目标以及加拿大增强的极地流出探针和欧洲群体任务对齐。他们还与新的加拿大航天局基于地面的Go-Canada计划保持一致。次要目标是利用开发等离子模拟代码的经验来了解与月球和彗星的太阳风相互作用。计划的培训旨在吸引和激发新一代太空科学家。