Collaborative Research: Magnetospheric Mass Density

了解冷等离子体质量密度对许多内磁层的磁层研究至关重要。例如，质量密度模型在辐射带研究、太阳风和磁层相互作用的磁流体动力学模型以及超低频波研究中具有重要意义。这是一个很难直接观察到的量，因此将使用间接方法。这种方法利用了alfvsamn波共振。该研究将通过将结果扩展到更接近地球（L~2）并提供三维模型来扩展先前的质量密度测定。得到的密度模型将由位置、太阳风和地磁条件参数化。由于来自THEMIS任务的新数据，我们对质量密度的了解将有所改善。这一建议的优势在于，它将解决超出目前研究范围的质量密度模型的巨大需求。如果这项研究的唯一成就是扩大密度模型的径向覆盖范围，那么它将是成功的，这是极有可能的。

Knowledge of the cold plasma mass density is critically important for a number of magnetospheric studies in the inner magnetosphere. For instance models of the mass density are important for radiation belt research, magnetohydrodynamic models of the solar wind and magnetosphere interaction and Ultra Low Frequency wave research. This is a very difficult quantity to observe directly so an indirect approach will be used. This approach makes use of Alfvén wave resonances. The research will expand on previous determinations of the mass density by extending the results closer to the Earth (L~2) and providing a 3D model. The resulting density model will be parameterized by location, solar wind and geomagnetic conditions. This improvement in our knowledge of the mass density will result because of new data from the THEMIS mission.The strength of this proposal is that it will address a great need for mass density models that extends beyond the present study. If the only accomplishment of this study is expanded radial coverage of the density models it will be a success and that is highly probable.