Mapping the Cusp (GEM)

这一建议是要求延续1991年的一年 奖 我们建议使用从协调的GEM获得的数据 数据活动，以测试和完善开放磁层模型， 托弗莱托和希尔1989年关于 磁层尖点到低海拔。 该模型提供 定量预测的当地时间范围和位置的 尖点的赤道边界和方向， 电离层对流的强度作为交叉的函数， 极冠势、IMF方向与太阳风动力学 压力 尖点的赤道边界暂时是 定义为电离层的那一部分的足迹 位于磁鞘音速向阳面的向阳面合并线 线 我们计划进行模型数据比较，作为测试 模型的假设和边界条件;该测试将 为制定改进模型的议程提供指导， 其中一些目前正在开发中。 最终我们 期望开发一个尖点离子沉淀模型，计算 通过追踪来自向阳面合并的粒子分布， 大尺度磁层内的电离层高度线， 由模型指定的电场。

This proposal is a request for the continuation of a 1 year 1991 award. We propose to use data obtained from the coordinated GEM data campaigns to test and refine the open-magnetosphere model of Toffoletto and Hill ?1989! with respect to the mapping of the magnetospheric cusp to low altitude. The model provides quantitative predictions of the local time extent and location of the equatorward boundary of the cusp and the direction and strength of ionospheric convection as functions of the cross- polar-cap potential, IMF direction and solar wind dynamic pressure. The equatorward boundary of the cusp is provisionally defined as the ionospheric footprint of that portion of the dayside merging line that lies sunward of the magnetosheath sonic line. We plan to do model-data comparisons as a means of testing the model's assumptions and boundary conditions; this test will provide a guide for setting an agenda for model improvements, some of which are currently under development. Ultimately, we expect to develop a model of cusp ion precipitation, calculated by tracing a distribution of particles from the dayside merging line to ionospheric altitude within the large-scale magnetic and electric fields specified by the model.