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

地球空间环境建模（GEM）项目是一个基础广泛、由社区发起的研究项目，研究地球磁层的物理特性以及磁层与大气和太阳风的耦合。GEM的工作是通过一系列运动和焦点小组来解决具体问题，从而构建具有预测能力的全球地球空间环流模型（GGCM）。该项目将为这一目标提供重要的结果，这些结果与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有关。此外，该项目还支持一名早期职业终身教职员工的研究，并为另一名早期职业女性科学家和一名研究生的研究培训做出贡献。本研究利用THEMIS和Van Allen探测器的航天器观测和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。要解决的具体科学问题包括：(1)热等离子体密度的变化如何引起合唱、嘶嘶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的“风暴时内磁层-电离层对流”和“科学磁测技术”焦点小组有关。

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".