Magnetospheric Density and Pressure in Equilibrium and Dynamic Models

平衡和动态模型中的磁层密度和压力

• 批准号: 0245664
• 负责人: Richard Denton
• 金额: $ 28.5万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-15 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0245664&HistoricalAwards=false
• 关键词: Magnetospheric; Density; Pressure; Equilibrium; Dynamic

This project will utilize data taken from the plasma wave data from the IMAGE spacecraft to develop a database of electron density as a function of time and position in the magnetosphere. That database will then be used to create realistic 3-D models of the Earth's plasmasphere. The plasmasphere model will then be used to simulate Pi2 wave events using Magnetohydrodynamic (MHD) simulations. The pressure in the plasmasphere can be anisotropic, a condition that cannot be easily incorporated into MHD simulations. The project will therefore use hybrid code simulations (fully kinetic, particle simulations of the ions and a fluid approximation for the electrons) to investigate the anisotropic pressure evolution and the heat flux that flows parallel to the magnetic field. The final step in the project is to develop a global MHD code that can incorporate the effects of anisotropic pressure in a self-consistent manner.

该项目将利用从成像航天器获得的等离子体波数据，开发一个关于磁层中电子密度随时间和位置变化的数据库。然后，该数据库将被用来创建真实的地球等离子体层3-D模型。等离子体层模型随后将用于通过磁流体动力学(MHD)模拟来模拟Pi2波事件。等离子体层中的压力可能是各向异性的，这一条件不容易被纳入MHD模拟。因此，该项目将使用混合代码模拟(完全动力学、离子的粒子模拟和电子的流体近似)来研究各向异性压力演变和平行于磁场流动的热流。该项目的最后一步是开发一种全球MHD代码，该代码可以以自洽的方式纳入各向异性压力的影响。