Numerical Analyses for Plasma Instabilities and Transport in the Magnetotail

磁尾等离子体不稳定性和输运的数值分析

• 批准号: 9312263
• 负责人: Crockett Grabbe
• 金额: $ 7.94万
• 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: 1994
• 资助国家: 美国
• 起止时间: 1994-06-01 至 1998-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9312263&HistoricalAwards=false
• 关键词: Numerical; Analyses; Plasma; Instabilities; Transport

9312263 Grabbe Numerical development and analysis of instabilities and transport in active regions of the Earth's magnetotail will be carried out. A set of parallel processing codes will model the transport driven by instabilities associated with ion beams and currents, as well as strong drifts caused by steep gradients and strong electrostatic fields around the plasma sheet - lobe transition, under a range of magnetotail conditions. A linear code and a transport code will include kinetic parts to evaluate growth and transport driven by ion beam instabilities and electron currents, and a fluid part for growth and transport driven by gradients and electrostatic fields present near the plasma sheet boundary layer. The plasma dispersion function used for the kinetic part of the code will be generalized to a modified plasma dispersion function in which the model distribution functions for beams, currents, and background plasma can be tailored for realistic input conditions. When the codes are developed they will be used for predicting transport processes under a variety of plasma conditions for models of regions near the plasma sheet boundary layer in the Earth's magnetotail. ***

小行星9312263 将对地球磁尾活跃区域的不稳定性和迁移进行数值研究和分析。 一组并行处理代码将模拟由与离子束和电流相关的不稳定性驱动的传输，以及在磁尾条件范围内由等离子体片瓣过渡周围的陡峭梯度和强静电场引起的强漂移。 线性代码和传输代码将包括用于评估由离子束不稳定性和电子流驱动的生长和传输的动力学部分，以及用于由等离子体片边界层附近存在的梯度和静电场驱动的生长和传输的流体部分。 用于动力学部分的代码的等离子体色散函数将被推广到修改后的等离子体色散函数，其中的模型分布函数的光束，电流和背景等离子体可以定制为现实的输入条件。 当代码的开发，他们将被用于预测运输过程中的各种等离子体条件下的模型的区域附近的等离子体片边界层在地球的磁尾。 ***