Time Dependent Modeling of Ionospheric Plasma Flows into the Magnetosphere

这项建议要求继续支持广泛的 模拟活动集中在高速运输的 极地进入磁层和电离层等离子体 偶合器. 具体而言，要求在以下方面提供支助 主要研究领域： 1. 使用我们的流体动力学三种离子物种（H+、He+、O+）极性 重现经典极地风观测的风模式 在不断变化的地球物理条件下， 对He+主导的瞬态流出进行建模。 单独的极性 风和上升流离子事件也将模拟和比较 观察。 这些比较将在合作中进行 与M博士Blanc，作案手法。钱德勒，J.M. Grebowsky和T.E.摩尔。 2. 用我们的方法进一步研究电离层-等离子体系统 电离层到共轭电离层模型。 具体研究包括 太阳活动周期和季节变化的研究 等离子体层参数，大气变化的影响， 中性氢对等离子体层密度的影响， 亚暴对电离层-等离子体相互作用系统的影响。 3. 一个多物种的模型将开发的基础上回旋 二十阶矩近似 耦合时变矩 输运方程将以二阶精度求解 (both Godunov型迎风差分技术 空间分裂。 数字方案本身正在 在美国宇航局空间物理理论的支持下， 程序;然而，它的应用，极地风和等离子体层 将在本提案的框架内进行流动。

This proposal requests continuing support for a broad spectrum of modeling activities concentrating on the high speed transport of polar into the magnetosphere and on ionosphere-plasmasphere coupling. Specifically, support is requested for the following major research areas: 1. The use our hydrodynamic three ion species (H+,He+,O+) polar wind model to reproduce observations of the classical polar wind under changing geophysical conditions with special attention to modeling the He+ dominated transient outflows. Individual polar wind and upwelling ions events will be also modeled and compared the observations. These comparisons will be done in cooperation with Drs. M. Blanc, M.O. Chandler, J.M. Grebowsky, and T.E. Moore. 2. Further studies of the ionosphere-plasmasphere system with our ionosphere to conjugate ionosphere model. Specific studies include the investigation of solar cycle and seasonal variations in plasmaspheric parameters, the effects of variations in atmospheric neutral hydrogen on plasmaspheric densities and modeling the effects of substorms on the coupled ionosphere-plasmasphere system. 3. A multispecies model will be developed based on a gyrotropic twenty moment approximation. The coupled time-dependent 20 moment transport equations will be solved with a second order accurate (both space and time) Godunov-type upwind differencing technique with dimensional splitting. The numerical scheme itself is being developed with the support of the NASA Space Physics Theory Program; however, its application to polar wind and plasmaspheric flows is to be carried out in the framework of this proposal.