Numerical Modeling of Magnetospheric Dynamics

磁层动力学数值模拟

• 批准号: 8820991
• 负责人: Daniel Swift
• 金额: $ 11.02万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-04-15 至 1991-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8820991&HistoricalAwards=false
• 关键词: Numerical; Modeling; Magnetospheric; Dynamics

Numerical modeling of physical processes related the aurora and substorm dynamics in the earth's magnetosphere will be studied. A numerical model will address the question of acceleration of auroral electrons. Appropriate boundary conditions and the role of collisions will be included in the calculations. The study of the transport of plasma (especially heavy ions) from the ionosphere to the plasma sheet will be conducted. The model should be able to explain the presence of O+ ions in the plasma sheet. The convection electric field can accelerate the ions over the polar cap. The role of ions in the substorm dynamics will be established by the numerical model. A magneto-inductive particle code will be used to model field- aligned currents. The model includes the effects of non- adiabatic particle motion in the self-consistent magnetic field. This model should be able to provide information on the storm- time interaction between auroral electrojet and the near-earth plasma sheet. The results from this model calculations will be useful in understanding current-driven ion cyclotron heating in a converging magnetic field. Information on the ion conics and micro-double layers also will available from this model.

极光物理过程的数值模拟 地球磁层的亚暴动力学 研究了 数值模型将解决以下问题： 极光电子的加速 适当的边界 条件和碰撞的作用将包括在 计算。 研究等离子体的传输（特别是 重离子）从电离层到等离子体片将是 进行。 该模型应该能够解释 等离子体片中的O+离子。 对流电场可以 加速离子越过极帽。 离子的作用 亚暴动力学将由数值模式建立。 一 磁感应粒子代码将用于模拟场- 排列的电流 该模型包括非- 自洽磁场中的绝热粒子运动。 这个模型应该能提供风暴的信息- 极光电喷流与近地天体的时间相互作用 等离子体片 该模型计算的结果将是 有助于理解电流驱动的离子回旋加热， 会聚磁场 关于离子二次曲线和 微双层也可从该模型获得。