Simulation of Current Driven Electrostatic Instabilities on Auroral Field Lines

极光场线上电流驱动静电不稳定性的模拟

• 批准号: 9119814
• 负责人: Kenichi Nishikawa
• 金额: $ 12.88万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-04-15 至 1995-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9119814&HistoricalAwards=false
• 关键词: Simulation; Current; Driven; Electrostatic; Instabilities

The newly developed Current Driven Double Layer (CUDDL) code will be used to investigate a number of outstanding questions relating to current driven processes on auroral field lines. The code includes upward and downward propagating oblique shear Alfven waves. Physical parameters relevant to auroral field line proceses will be modeled, including the magnitude and spatial variation of plasma and current density and magnetic field. These new runs will enable tests of scaling laws suggested by analytic theory and provide more insight into the physics of processes such as soliton and double layer formation, current filamentation, electron acceleration and heating. The role of density gradients parallel to the magnetic field will also be studied, making sure that the critical current for instabilities lies in the simulation system.

新开发的电流驱动双层（CUDDL）代码将 用于调查一些悬而未决的问题， 到极光场线上电流驱动的过程。 代码 包括向上和向下传播的斜向剪切阿尔芬 波 与极光场线过程有关的物理参数 将被建模，包括大小和空间变化的 等离子体和电流密度以及磁场。 这些新的运行将 能够测试分析理论提出的标度律， 提供了更多的物理过程，如孤子 双电层形成、电流分布、电子 加速和加热。 平行密度梯度的作用 也将研究磁场，以确保 不稳定性的临界电流存在于模拟系统中。