Numerical Analyses for Plasma Instabilities and Transport in the Magnetotail

9312263 Grabbe将对地球磁尾活动区域的不稳定性和输运进行数值发展和分析。在一系列磁尾条件下，一组并行处理代码将模拟与离子束和电流相关的不稳定性驱动的输运，以及由陡坡和强静电场引起的等离子体片瓣转变周围的强漂移。线性代码和输运代码将包括动力学部分，用于评估由离子束不稳定性和电子电流驱动的生长和输运，以及由等离子体片边界层附近的梯度和静电场驱动的生长和输运的流体部分。用于代码动力学部分的等离子体色散函数将被推广为一个修正的等离子体色散函数，其中光束、电流和背景等离子体的模型分布函数可以根据实际输入条件进行调整。当这些代码被开发出来后，它们将用于预测地球磁尾等离子体片边界层附近区域模型在各种等离子体条件下的输运过程。＊＊＊

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. ***