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: 2307203
• 负责人: Shiva Kavosi
• 金额: $ 45.17万
• 依托单位: Embry-Riddle Aeronautical 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=2307203&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.

磁重联和Kelvin-Helmhotz不稳定性（KHI）被认为是磁层与太阳风之间的两种主要耦合机制。这种耦合使得两个区域之间能够进行能量和粒子交换。该项目研究这些现象，以深入了解地球偶极子作为等离子体穿越磁层顶的时间函数的重要性、电离层动态及其对理解空间天气的影响。更广泛的影响包括一名研究生的支持，研究由早期职业女性科学家领导，该项目利用现场和磁流体动力学模拟数据，重点研究偶极子倾斜对地球磁层顶边界KHI的影响以及相关的地磁扰动。以下科学问题的解决：偶极倾斜效应KHI和它的特点，在不同的IMF和太阳风等离子体条件下，和偶极倾斜效应KHI相关的地磁扰动地面。观测数据（统计研究）和开放地球空间大气环流模型（OpenGGCM）的建模相结合，将用于解决偶极子倾斜对KHI的影响，以及如何影响KHI在地面上激发的地磁扰动。该项目利用NSF资助的地面数据集，包括磁强计观测和SuperDARN雷达。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。