[2017-06-28, 林郁 教授] 利用三维全球混合模拟研究磁尾的传输过程

时间……….....周三, 2017年06月28日, 下午 03:00 
地点…….........物理大楼 北 415
讲座嘉宾….. ..林郁 教授(美国Auburn大学物理系)
讲座题目…… 利用三维全球混合模拟研究磁尾的传输过程

讲座摘要:

The Auburn global hybrid code in 3-D (ANGIE3D) that solves the fully kinetic ion physics is utilized to simulate the dynamics of the Earth’s magnetotail. The focus of this talk will be on the structure and wave dynamics associated with fast flows generated by magnetic reconnection in the near- to mid-tail plasma sheet.  3-D flux ropes are shown in the structure of reconnection, with a width of 1-5 earth radii in the dawn-dusk direction. The earthward accelerated flux ropes then merge and form low entropy ‘bubbles’ as the flux tubes shorten. Alfven/kinetic Alfven waves (KAWs) and compressional waves are generated from the reconnection and near the global dipolarization front, with strong turbulence at the flow braking. The wave/turbulence spectrum, ion acceleration/heating, and plasma global transport to the inner magnetosphere are presented. In addition, KAWs are found to be a common feature of magnetic reconnection. Their structures and roles in ion heating/acceleration are illustrated with a local hybrid simulation.