GEM: Statistical Analysis of Ring Current Plasma Sources

这个项目将研究地球环电流的动力学，以及这种动力学如何与引起环电流的带电粒子的各种来源有关。将讨论的四个主要专题是：(1)地球同步轨道上的等离子体性质随太阳风参数的变化，(2)从电离层向地球同步轨道直接注入离子的意义，(3)太阳风参数和电离层-磁层耦合引起的DST指数(衡量环流引起的地面磁扰动)的演变，以及(4)电离层离子流出、等离子体片中离子密度的演变和磁暴恢复阶段之间的联系。该项目将结合经验建模、统计分析和数值模拟。将产生两个新的经验模型，这两个模型将对空间物理和空间天气建模有用。将建立内等离子体片的模型，该模型可用于产生环电流模拟的边界条件。第二个模型将提供DST和等离子体源驱动器之间的关系，可以与数值模拟进行比较。

This project will investigate the dynamics of the earth's ring current and how the dynamics relate to the various sources of charged particles that give rise to the ring current. The four major topics which will be addressed are: (1) the plasma properties at geosynchronous orbit as a function of solar wind parameters, (2) the significance of direct ion injection from the ionosphere into geosynchronous orbit, (3) the evolution of the Dst index (a measure of the magnetic perturbation on the ground due to the ring current) due to solar wind parameters and ionospheric-magnetospheric coupling, and (4) the connection between ionospheric ion outflow, the evolution of the ion density in the plasma sheet and the recovery phase of magnetic storms. The project will combine empirical modeling, statistical analysis and numerical simulations. Two new empirical models will be produced that will be useful for space physics and space weather modeling. A model of the inner plasma sheet will be developed which can be used to produce boundary conditions for ring current simulations. The second model will provide a relationship between Dst and the plasma source drivers which may be compared to numerical simulations.