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.

该项目的重点是研究近地空间环境中电磁离子回旋波（EMIC）的产生、传播和耗散。 EMIC 波是由等离子体与地球磁场相互作用产生的。 这些波在范艾伦辐射带中粒子的激发和损失中发挥着重要作用。 由于辐射带与卫星运行的区域重叠，了解可能改变其强度的因素是预测空间天气影响的一个重要方面。 该项目将结合观测和数值建模来解决 EMIC 波浪动力学问题。 该领域以前的大多数建模都使用光线追踪方法。 该项目采用了使用全波模型来模拟波浪动力学的新颖方法。 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。 研究人员还将计划通过与等离子体物理和聚变能源科学项目国家本科生奖学金计划的合作，为本科生提供参与研究的机会。更具体地说，该项目解决了以下问题； (a) 赤道产生的 EMIC 波如何到达地面？； (b) EMIC 波传播如何受到地磁活动的影响？； (c) 磁层/电离层参数和波法线角对 EMIC 波从磁层到电离层传播的相对贡献是什么？为了实现这一目标，研究人员计划采用最近开发的具有真实等离子体参数的二维全波代码进行全波模拟。我们还将分析范艾伦探测器、THEMIS 和 GOES 卫星最近对这些波的观测结果，并将它们与地面磁力计网络的观测结果进行比较。