太阳风与火星相互作用过程中等离子体运动和磁场结构起着重要作用。然而受限于观测数据以及数值模拟方法的欠缺，目前对相互作用过程中离子成分、离子动力学过程、地壳磁场等尚不完全清楚。而且，包括 Hall效应和有限Larmor半径（FLR）效应在内的离子动力学效应对火星空间环境中等离子体运动、磁场结构和磁异常等有重要影响。本项目拟采用包括Hall效应和FLR效应的离子动力学全球MHD模型，通过数值模拟研究火星全球空间环境中等离子体运动和磁场特性；通过与观测结果比较，研究离子动力学尺度下离子成分、离子动力学效应和地壳磁场对火星空间环境的影响；并分析离子逃逸的机制及其在太阳风火星相互作用过程中所起的作用。本项目的研究将加深人们对火星全球空间等离子体环境的结构和动力学特性的理解，有助于我们更好地了解火星大气环境演化的过程，为我国未来开展火星探测打下科学基础。

The magnetic field structure and plasma feature during the process of the solar wind interaction with Mars are of importance. Albeit many studies from numerical simulation and spacecraft data analysis, the influences of plasma ingredients, ion kinetic features and crustal magnetic field on the interaction are still open questions. In fact, the ion kinetic effects, such as Hall and finite Larmor radius (FLR) effects play an important role on the plasma characteristics, magnetic field structure in the process of the solar wind interaction with Mars. The purpose of the proposal is to develop a global extended MHD code to simulate the solar wind interaction with Mars, with consideration of Hall and FLR effects. In conjunction with spacecraft data analysis, the influence of plasma ingredients, ion kinetic effects and the crustal magnetic field on the interaction will be numerically studied in the order of ion kinetic scale. This research will help to understand the process of the solar wind interaction with Mars, and the evolution of the Marian atmosphere as well.