M-I Coupling: Study of Magnetospheric Dynamics with Ionospheric Outflows

流出的电离层离子对磁层动力学的影响本身就是一个很难研究的问题。研究这种现象的一种自然方法是利用动力学粒子模拟。进行这种模拟的困难在于需要大量的计算机时间来产生物理上合理的结果。开发了新版本的EMPM(电磁粒子模型)代码，以利用诸如Origin 2000或Cray T3E等大规模并行计算机的能力。这一新代码将在空间分辨率方面比以前的代码提高两倍，并将提供更好的内部磁层和环流的动力学。外流重离子的电离层模型将被用于将这些离子注入磁层。然后，EMPM代码将被用于研究受重离子存在影响的磁暴的动力学。特别是，将调查行星际磁场(IMF)变化的影响。这将使用简化的时变IMF来确定变化的IMF对由于电离层离子溢出而产生的M-I耦合的影响。

The effects of outflowing ionospheric ions on the dynamics of the magnetosphere is an inherently very difficult problem to study. A natural way of studying such phenomena is to utilize kinetic particle simulations. The difficulty in doing such simulations has been the large amounts of computer time required to generate physically reasonable results. New version of the EMPM (Electromagnetic Particle Model) code has been developed to make use of the capabilities of massively parallel computers such as the ORIGIN 2000 or the Cray T3E. This new code will provide a factor of two improvement in spatial resolution over the previous code and will provide better dynamics of the inner magnetosphere and ring current.Ionopsheric models of outflowing heavy ions will be used to incorporate the injection of these ions into the magnetosphere. The EMPM code will then be used to study the dynamics of magnetic storms as affected by the presence of heavy ions. In particular, the effect of changes in the interplanetary magnetic field (IMF) will be investigated. This will be done using simplified time-varying IMFs to determine the effect of the varying IMF on the M-I coupling due to overflow of ionospheric ions.