Collaborative Research: GEM--Multi-scale Magnetosphere-Ionosphere-Thermosphere Coupling Dynamics Driven by Bursty Bulk Flows

合作研究：GEM——突发体流驱动的多尺度磁层-电离层-热层耦合动力学

• 批准号: 2349873
• 负责人: Zihan Wang
• 金额: $ 14.82万
• 依托单位: University of Texas at Arlington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-04-01 至 2027-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2349873&HistoricalAwards=false
• 关键词: Collaborative; Research; GEM; Multi; scale

This collaborative project aims to investigate the fast plasma flows within the Earth's nightside magnetosphere and their effects on the upper atmosphere (ionosphere and thermosphere). The dynamics of the fast plasma flows is an outstanding magnetosphere-ionosphere-thermosphere coupling problem associated with sudden magnetic field topology reconfiguration and explosive current formation, particle acceleration, and energy release in the magnetosphere. The simulation-observation results of this project will significantly deepen our understanding of magnetosphere-upper atmosphere coupling processes in the nightside transition region. Funds provided by this grant will promote two young researchers' professional development, including one postdoc. PI Dr. Zou, a female faculty member, will lead the team, mentor the early career scientists, and advise graduate students. This project studies the dynamics of BBFs and their effects on the coupled MIT system using a two-way coupled global MHD-PIC model within the Space Weather Modeling Framework (SWMF) and comprehensive multi-instrument observations. Specific science questions to be addressed include: (SQ1) What are the particle velocity distributions associated with BBF? How do they evolve as BBF propagates earthward? (SQ2) How are the FACs distributed in the BBF dipolarization regions? Are their dawn-dusk asymmetries as suggested by recent theory? Can multiple BBFs and their wedgelets form the traditional SCW? (SQ3) What is the impact of BBF on the nightside IT system in terms of ionospheric density structures and airglow emission? The results of this project will be valuable to multiple new GEM focus groups and will also benefit the CEDAR community by deepening the understanding of the magnetospheric drivers that cause impulsive energy release into the IT system. The proposed activity will also enhance the scientific return of the NSF-supported radar facilities, AMPERE, and SuperMAG projects.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这个协作项目旨在研究地球夜间磁层内的快速血浆流及其对上层大气（电离层和热层）的影响。快速等离子体流的动力学是与突然的磁场拓扑重构和爆炸性电流形成，颗粒加速度和磁层中的能量释放相关的出色磁层 - 热层 - 热圈耦合问题。该项目的仿真观察结果将显着加深我们对夜幕过渡区域中磁层 - upper大气耦合过程的理解。这笔赠款提供的资金将促进两个年轻的研究人员的专业发展，其中包括一个博士后。女教师Zou博士将领导团队，指导早期职业科学家，并为研究生提供建议。该项目使用在太空天气建模框架（SWMF）和全面的多仪器观察中使用双向耦合的全局MHD-PIC模型研究BBF的动力及其对耦合MIT系统的影响。要解决的特定科学问题包括：（SQ1）与BBF相关的粒子速度分布是什么？随着BBF传播地球，它们如何发展？ （SQ2）FACS如何分布在BBF偶极性区域中？他们的黎明dusk不对称是最近理论所暗示的吗？多个BBF及其楔形可以形成传统的SCW吗？ （SQ3）在电离层密度结构和气流发射方面，BBF对夜边IT系统有什么影响？该项目的结果将对多个新的宝石焦点小组很有价值，也将通过加深对磁层驱动器的理解来使雪松社区受益，从而使磁层驱动器导致冲动能量释放到IT系统中。拟议的活动还将增强NSF支持的雷达设施，Ampere和Supermag项目的科学回报。该奖项反映了NSF的法定任务，并通过基金会的智力优点和更广泛的影响来评估NSF的法定任务。