Collaborative Research: GEM: Global Simulations of Non-Ideal Transport in the Magnetotail

合作研究：GEM：磁尾非理想输运的全局模拟

• 批准号: 1404322
• 负责人: Aleksandr Ukhorskiy
• 金额: $ 12.42万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-06-01 至 2018-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1404322&HistoricalAwards=false
• 关键词: Collaborative; Research; GEM; Global; Simulations

Plasma from the tail reconnection site is transported into the inner magnetosphere where it forms the ring current. The most common type of model for studying this transport is a global magnetohydrodynamic (MHD) model. These are frequently coupled with models of the plasma transport in the inner magnetosphere since MHD models do not describe the physics well in the inner magnetosphere. This is a project to enhance the physics of the MHD models in the tail where they work best. This effort will add diamagnetic (pressure driven) drifts, inertial drifts, finite Larmor radius effects on the pressure tensor, and the energy dependence of these drifts. The improved model will be used to study magnetospheric convection, fast bursty bulk flows and dipolarization fronts, the Kelvin-Helmholtz instability and the structure of thin current sheets.The improved simulation code when coupled with an inner magnetosphere model will be useful in studying transport during magnetic storms. Therefore it will valuable for space weather studies. Since space weather represents a series hazard this work may be of significant societal value.

来自尾部重联位置的等离子体被输送到内部磁层，在那里形成环电流。研究这种输运的最常见的模型是全球磁流体(MHD)模型。由于MHD模型不能很好地描述内部磁层的物理特性，这些模型经常与内部磁层中的等离子体传输模型相结合。这是一个项目，旨在增强尾部MHD模型的物理性能，这些模型在尾部工作得最好。这一努力将增加抗磁(压力驱动)漂移、惯性漂移、有限拉莫尔半径对压力张量的影响，以及这些漂移的能量依赖性。改进后的模式将用于研究磁层对流、快速爆发的块流和双极化锋面、开尔文-亥姆霍兹不稳定性和薄电流片的结构。改进的模拟程序与内部磁层模式相结合，将有助于研究磁暴期间的输运。因此，对空间气象研究具有一定的参考价值。由于空间天气代表着一系列危险，这项工作可能具有重大的社会价值。