GEM: Simulations of Diffuse Auroral Electron Transport and Precipitation in Realistic Model Storms and Substorms

GEM：真实模型风暴和亚暴中漫射极光电子输运和降水的模拟

• 批准号: 0902832
• 负责人: Margaret Chen
• 金额: $ 30万
• 依托单位: Aerospace Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-10-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0902832&HistoricalAwards=false
• 关键词: GEM; Simulations; Diffuse; Auroral; Electron

This project will develop a model of the spatial and temporal variation of electron precipitation in the diffuse aurora. The project will utilize an existing, physics-based model of Earth's ring current and add electron losses due to pitch-angle scattering. The existing model will be improved to include a realistic magnetic field model as opposed to a simple dipole model and to have a self-consistent description of the electric field. The modeled electron precipitation will be used to calculate the ionospheric conductivity tensor for different magnetic conditions.The model will be made available to the space science community and will be useful in developing a Geospace General Circulation Model (GGCM) which is one of the main goals of the Geospace Environment Modeling (GEM) program. The ability to calculate ionospheric conductances will be useful in understanding the coupling of the magnetosphere to the ionosphere. The project will improve our predictive space weather capabilities, which will have societal and economic benefits.

本项目将建立一个扩散极光中电子沉淀的空间和时间变化模型。 该项目将利用现有的基于物理学的地球环电流模型，并增加由于俯仰角散射造成的电子损失。 现有的模型将得到改进，包括一个现实的磁场模型，而不是一个简单的偶极子模型，并有一个自洽的电场描述。 模拟的电子沉降将用于计算不同磁场条件下的电离层电导率张量，该模型将提供给空间科学界，并将有助于开发地球空间大气环流模型，这是地球空间环境建模方案的主要目标之一。 计算电离层电导的能力将有助于理解磁层与电离层的耦合。 该项目将提高我们预测空间天气的能力，这将产生社会和经济效益。