极光增亮现象的全球MHD数值模拟

Auroral brightening, which is offen used as signs of localized magnetospheric activity, is one of the most outstanding phenomenom in the solar wind-magnetoshphere-ionosphere (SMI) coupling. Hence, the study of the auroral features, such as the auroral intensity and its spatial and temparol evolution, is one of crucial issues of space physics. Using global MHD simualtion model and observations from Polar and IMAGE, we will simulate the auroral brightenings under different condtions, and invetigate the auroral features and their correlation with the magnetospheric activities, give some disscussions on the physical mechanisms.

极光增亮现象是太阳风－磁层－电离层耦合过程中的重要现象。极光强度及其在电离层的分布演化特征反映了磁层不同区域的活动情况。因此，极光强度及其在电离层的分布演化特征一直是空间物理的前沿课题。本项目将利用全球MHD数值模型，结合Polar与IMAGE的极光观测数据,实现对不同太阳风条件下的极光增亮现象的数值模拟，并与观测结果相比较，系统研究极光增亮现象与太阳风条件和磁层活动的关系。