报告题目：Turbulent dynamo in diverse astrophysical environments

　　报告人：徐思遥

　　报告人简介：美国威斯康辛大学麦迪逊分校博士后，主要从事磁流体湍流及其在天体物理中的应用方向的研究，如磁场放大、宇宙射线输运、恒星形成等。曾获2019年由国际理论物理和应用物理联合会（IUPAP）天体粒子物理委员会（C4）颁发的青年科学家奖，2019年Cecilia Payne-Gaposchkin天体物理博士论文奖，2017年国际天文学联合会优秀博士论文奖，和2017年哈勃博士后基金。

　　报告摘要：As a fundamental problem of magnetohydrodynamic physics, turbulent dynamo accounts for the growth and maintenance of the cosmic magnetism in most astrophysical settings. However, for decades studies of turbulent dynamo were limited to its linear kinematic regime, which in most cases is of little astrophysical relevance. The Xu & Lazarian (2016, XL16) theory brings the application of turbulent dynamo to astrophysically significant regimes, which include the dynamo regime at a low ionization degree and the nonlinear dynamo regime. XL16 predicted a new regime for turbulent dynamo at a low ionization degree. By carrying out the first supercomputer 3D two-fluid dynamo simulation, we for the first time numerically confirmed this prediction. The XL16 theory has a general applicability to studying the magnetism in diverse astrophysical environments, such as the magnetic field amplification for the first star formation and in supernova remnants.

　　报告时间：2019年11月11日（星期一）下午2:30

　　报告地点：仙林园区3-302会议室

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紫金山天文台学术委员会