Collaborative Research: GEM--Global Propagation Characteristics of Electromagnetic Ion Cyclotron Waves

合作研究：GEM--电磁离子回旋波的全局传播特性

• 批准号: 1602560
• 负责人: Hyomin Kim
• 金额: $ 6.32万
• 依托单位: New Jersey Institute of Technology
• 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: 2017-08-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1602560&HistoricalAwards=false
• 关键词: Collaborative; Research; GEM; Global; Propagation

The focus of project is to investigate the creation, propagation, and dissipation electromagnetic ion cyclotron waves (EMIC) in the near-Earth space environment. EMIC waves are created by the interaction of plasma with the Earth's magnetic field. These waves play an important role in both the energization and loss of particles in the Van Allen radiation belts. Since the radiation belts overlap the region where satellites operate understanding the factors that can change their intensity is an important aspect of predicting space weather impacts. This project will use a combination of observations and numerical modeling to address EMIC wave dynamics. Most previous modeling in this area has used ray-tracing methods. This project takes the novel approach of using a full wave model to simulate the wave dynamics. The project will support the efforts of young female scientist who is serving as the PI. It will also provide support to PhD graduate student. 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. More specifically this project addresses the following questions; (a) How do equatorially generated EMIC waves reach the ground?; (b) How is EMIC wave propagation affected by geomagnetic activity?; and (c) What are the relative contributions of magnetospheric/ionospheric parameters and wave normal angle to EMIC wave propagation from the magnetosphere to the ionosphere? To achieve this goal, the investigators plan to perform full-wave simulations employing recently developed 2D full-wave code with realistic plasma parameters. We will also analyze recent observations of these waves by Van Allen Probes, THEMIS and GOES satellites and compare them with observations from the ground magnetometer network.

项目的重点是研究在近地球空间环境中的创建，繁殖和耗散电磁离子环（EMIC）。 EMIC波是由等离子体与地球磁场的相互作用产生的。 这些波在Van Allen辐射带中的颗粒的能量和损失中都起着重要作用。 由于辐射带重叠了卫星经营的区域，了解改变其强度的因素是预测空间天气影响的重要方面。 该项目将结合观测和数值建模来解决EMIC波动力学。 该领域的大多数先前建模都使用了射线追踪方法。 该项目采用了使用全波模型模拟波动力学的新方法。 该项目将支持担任PI的年轻女科学家的努力。 它还将为博士研究生提供支持。 调查人员还计划通过与国家大学本科奖学金计划合作在血浆物理和融合能源科学计划中的合作伙伴关系来为大学生提供机会。更具体地说，该项目解决了以下问题； （a）赤道生成的emic波如何到达地面？ （b）emic波传播如何受地磁活性影响？ （c）磁层/电离层参数的相对贡献以及从磁层到电离层的EMIC波传播的正常​​角度的相对贡献是什么？为了实现这一目标，调查人员计划使用最近开发的2D全波代码，具有现实的等离子体参数。我们还将通过Van Allen探针，Themis和Goes卫星分析这些波的最新观察结果，并将它们与地面磁力计网络的观测值进行比较。