Collaborative Research: Dipole Tilt Effect on Kelvin-Helmholtz Instability and Its Associated Ionospheric and Geomagnetic Signatures

合作研究：偶极子倾斜对开尔文-亥姆霍兹不稳定性及其相关电离层和地磁特征的影响

• 批准号: 2307205
• 负责人: Xueling Shi
• 金额: $ 7.5万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-06-15 至 2026-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2307205&HistoricalAwards=false
• 关键词: Collaborative; Research; Dipole; Tilt; Effect

Magnetic reconnection and the Kelvin-Helmhotz Instability (KHI) are believed to be the two major coupling mechanisms between the magnetosphere and the solar wind. This coupling enables energy and particle exchange between the two regions. This project studies these phenomena to provide insight into the importance of Earth’s dipole as a function of time for plasma transport across the magnetopause, the Ionosphere dynamic, and its implications for understanding space weather. The broader impacts include support of a graduate student and the research is led by early career woman scientists.The project focuses on the dipole tilt effects on the KHI at the Earth’s magnetopause boundary and the associated geomagnetic perturbations using both in situ and MHD simulation data. The following Science Questions are addressed: dipole tilt effects on KHI and its characteristics under different IMF and solar wind plasma conditions, and the dipole tilt effects on KHI-associated geomagnetic perturbations on the ground. A combination of observational data (statistical study) and modeling with Open Geospace General Circulation Model (OpenGGCM) will be used to address the dipole tilt effects on KHI and how that affects the geomagnetic perturbations excited by KHI on the ground. The project utilizes NSF funded ground-based data sets including magnetometer observations and SuperDARN radar.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.

磁重新连接和开尔文 - 螺旋不稳定（KHI）被认为是磁层和太阳风之间的两个主要耦合机制。这种耦合使两个区域之间的能量和粒子交换。该项目研究了这些现象，以洞悉地球偶极子作为跨磁层，电离层动态的等离子体传输的时间的重要性及其对理解空间天气的影响。更广泛的影响包括对研究生的支持，研究是由早期职业女性科学家领导的。该项目侧重于地球磁性边界对KHI的偶极倾斜影响以及使用原位和MHD模拟数据的相关的地磁扰动。解决了以下科学问题：在不同的IMF和太阳风等离子体条件下对KHI及其特征的偶极倾斜影响，以及偶极倾斜对地面上KHI相关的地磁扰动的影响。观察数据（统计研究）与开放地理水平通用循环模型（OpenGGCM）的结合将用于解决偶极倾斜对KHI的影响，以及如何影响KHI激发KHI对地面上的地磁扰动的影响。该项目利用了NSF资助的基于地面的数据集，包括磁力计观测值和SuperDarn Radar。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响评估标准，通过评估被认为是珍贵的支持。