Collaborative Research: GEM: Modulation of Plasma Waves by Thermal Plasma Density Variation in the Inner Magnetosphere

合作研究：GEM：内磁层热等离子体密度变化对等离子体波的调制

• 批准号: 1405041
• 负责人: Lunjin Chen
• 金额: $ 26.55万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-10-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1405041&HistoricalAwards=false
• 关键词: Collaborative; Research; GEM; Modulation; Plasma

The Geospace Environment Modeling (GEM) Program is a broad-based, community-initiated research program on the physics of the Earth's magnetosphere and the coupling of the magnetosphere to the atmosphere and to the solar wind. The work of GEM is accomplished in a series of campaigns and focus groups that solve specific problems leading to the construction of a global Geospace General Circulation Model (GGCM) with predictive capability. This project will contribute essential results to this goal pertaining to understanding the role of plasma waves in energizing and transporting particles and plasma in the near-Earth space environment. In addition, the project supports the research of an early-career tenure-track faculty member and contributes to the research training of another early-career female scientist and a graduate student.This investigation utilizes both spacecraft observations from THEMIS and Van Allen Probes and the HOTRAY wave ray-tracing computer code to study the modulation of plasma wave intensity by thermal plasma density variations in the inner magnetosphere. The specific science questions to be addressed include: (1) How do thermal plasma density variations cause modulation in the intensity of chorus, hiss and magnetosonic waves? and (2) How do the waves excited by these density variations affect radiation belt and ring current? The investigation is relevant to the GEM Focus Groups on "Storm-Time Inner Magnetosphere-Ionosphere Convection", and "Scientific Magnetic Mapping & Techniques".

地球空间环境模拟（GEM）计划是一项基础广泛、由社区发起的研究计划，研究地球磁层物理学以及磁层与大气层和太阳风的耦合。 GEM 的工作是通过一系列活动和焦点小组来完成的，这些活动和焦点小组解决了具体问题，从而构建了具有预测能力的全球地球空间大气环流模型（GGCM）。该项目将为这一目标贡献重要成果，涉及了解等离子体波在近地空间环境中激发和传输粒子和等离子体的作用。 此外，该项目还支持一名职业生涯早期的终身教授的研究，并为另一位职业生涯早期的女科学家和一名研究生的研究培训做出贡献。这项研究利用了 THEMIS 和范艾伦探测器的航天器观测以及 HOTRAY 波射线追踪计算机代码来研究内磁层中热等离子体密度变化对等离子体波强度的调制。需要解决的具体科学问题包括：（1）热等离子体密度变化如何引起合唱波、嘶嘶声和磁声波强度的调制？ (2) 这些密度变化激发的波如何影响辐射带和环电流？该调查与 GEM 焦点小组“风暴时期内磁层-电离层对流”和“科学磁测图与技术”相关。