Collaborative Research: Substorm Particle Injection into the Ring Current--MagnetoHydroDynamic (MHD) with Embedded Particle-In-Cell (PIC) Simulation Approach

合作研究：亚暴粒子注入环流——磁流体动力（MHD）与嵌入式粒子在细胞（PIC）模拟方法

• 批准号: 2040330
• 负责人: Giovanni Lapenta
• 金额: $ 5.4万
• 依托单位: SPACE SCIENCE INSTITUTE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-12-01 至 2023-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2040330&HistoricalAwards=false
• 关键词: Collaborative; Research; Substorm; Particle; Injection

Magnetic storms generate energetic particles and strong wave activity in the magnetosphere. Modeling this system is of critical importance both for its societal and scientific relevance. This work will use a combined fluid-particle modeling approach to understand the role of kinetic processes in the inner magnetosphere. A graduate student will be trained and a new more realistic model of the storm time inner magnetosphere magnetic field, including the ring current, will be made publicly available to the space weather community.The project will study the process of particle injection from the magnetotail by developing, validating, and using a self-consistent particle-in-cell (PIC) simulation embedded in a global magetohydrodynamic (MHD) simulation of the solar wind-magnetosphere-ionosphere system. By using the multi-scale particle-in-cell (MSPIC) approach featuring an implicit PIC system that encompasses a large fraction of the inner magnetosphere, they will investigate ring current injection and acceleration during magnetic storm related substorms. This will enable the study of wave-particle interactions missing from other large-scale ring current simulation models.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.

磁暴在磁层中产生高能粒子和强烈的波动活动。对这一系统进行建模对于它的社会和科学意义都是至关重要的。这项工作将使用流体-粒子相结合的模拟方法来理解内部磁层中动力学过程的作用。一名研究生将接受培训，包括环电流在内的风暴时间内磁层磁场的新模型将向空间气象界公开。该项目将通过开发、验证和使用嵌入太阳风-磁层-电离层系统的全球磁流体动力学(MHD)模拟的自洽粒子在单元(PIC)模拟来研究从磁尾注入粒子的过程。通过使用多尺度粒子单元(MSPIC)方法，他们将研究与磁暴相关的亚暴期间的环电流注入和加速。这将使研究其他大型环流模拟模型中缺失的波-粒子相互作用成为可能。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Magnetohydrodynamic Turbulence in the Earth’s Magnetotail From Observations and Global MHD Simulations

• DOI: 10.3389/fspas.2021.620519
• 发表时间: 2021-03
• 作者: M. El‐Alaoui;R. Walker;J. Weygand;G. Lapenta;M. Goldstein