Title: Turbulent Shocks in Astrophysics

　　Speaker: Dr. J. R. Jokipii (Regents' professor; University of Arizona)

　　Time & Location: 本周五（10月11日）下午3点半，苏富特三楼会议室

　　Abstract: Large-scale fluids in nature are nearly always turbulent. Fluctuations in parameters such as velocity and magnetic field are present over a broad range of spatial scales and usually have large magnitudes. Shock waves propagating in these fluidsare far from planar and developripples and other fluctuations which significantly affect their properties. Spacecraft observations of interplanetary shocks provide strong evidence forsuch effects. Effects of turbulence are evident in images of supernova remnants. I will go on to show how such effects at a supernova blast wave can amplify the magnetic field by large factors. Also, the acceleration of cosmic rays is significantly affected and this effectis seen in interplanetary shocksand this can explain some puzzling observations.

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