Bow Shock-Magnetopause Coupling Processes as a Function of Interplanetary Magnetic Field (IMF) Orientation

弓激波-磁层顶耦合过程作为行星际磁场 (IMF) 方向的函数

• 批准号: 1007449
• 负责人: Nojan Omidi
• 金额: $ 62.49万
• 依托单位: Solana Scientific Inc.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-10-01 至 2015-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1007449&HistoricalAwards=false
• 关键词: Bow; Shock; Magnetopause; Coupling; Processes

This project will examine the physical processes the couple Earth's magnetosphere to the solar wind. The project will specifically address the processes in the foreshock region, the bow shock itself, and the magnetosheath region that lies between the bow shock and the magnetopause. The objective is to understand these processes as a function of the interplanetary magnetic field (IMF) orientation. The direction of IMF determines the position of the foreshock, properties and the nature of ULF turbulence in the dayside magnetosheath and the nature of transport processes at the magnetopause such as locations of magnetic reconnection or presence or absence of the Kelvin-Helmholtz (K-H) instability. Another important factor will be to understand how solar wind discontinuities interact with the foreshock and bow shock and how the discontinuities propagate through the magnetosheath and impact the magnetopause.The project will primarily use global hybrid simulations (kinetic ions, fluid electrons) to examine the details of the physical processes involved. Results from the simulations will be compared with spacecraft data from missions such as Cluster and THEMIS as well as ground-based observations from all-sky imagers and magnetometers. The proposed work includes participation of undergraduate and graduate students in space physics at Embry Riddle Aeronautical University and the National Autonomous University of Mexico who will learn about theory and modeling and will work on comparing simulation and spacecraft data. The results of the proposed studies will be presented at scientific meetings and published in peer-reviewed scientific literature. All the spacecraft data processed for this study will be made available to the community.

这个项目将研究地球磁层与太阳风耦合的物理过程。该项目将专门研究前震区、弓形激波本身以及位于弓形激波和磁层顶之间的磁鞘区。目的是了解这些过程作为行星际磁场方向的函数。IMF的方向决定了前震的位置、日侧磁鞘中极低频湍流的性质和性质，以及磁层顶输运过程的性质，如磁重联的位置或开尔文-亥姆霍兹（K-H）不稳定性的存在与否。另一个重要的因素将是了解太阳风不连续如何与前激波和弓形激波相互作用，以及不连续如何通过磁鞘传播并影响磁层顶。该项目将主要使用全局混合模拟（动态离子，流体电子）来检查所涉及的物理过程的细节。模拟结果将与来自Cluster和THEMIS等任务的航天器数据以及来自全天空成像仪和磁力计的地面观测数据进行比较。拟议的工作包括Embry Riddle航空大学和墨西哥国立自治大学空间物理学专业的本科生和研究生的参与，他们将学习理论和建模，并将比较模拟和航天器数据。拟议研究的结果将在科学会议上提出，并在同行评议的科学文献中发表。为这项研究处理的所有航天器数据都将提供给社区。