[Seminar]

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　　Title: Cosmic ray transport in MHD turbulence

　　Speaker: Prof. Huirong Yan

　　Affiliation: Kavli Institute of Astronomy and Astrophysics, Peking University

　　Time:  Oct 22, 2013 (Tuesday) 9:30 a.m.

　　Venue: Meeting Room 401 (Main Building)

　　Abstract:

　　Cosmic ray (CR) transport and acceleration is essential for many astrophysical problems, e.g., CMB foreground, ionization of molecular clouds and all high energy phenomena. Recent advances in MHD turbulence call for revisions in the paradigm of cosmic ray transport. We use the models of magnetohydrodynamic turbulence that were tested in numerical simulation, in which turbulence is injected at large scale and cascades to to small scales. I shall address the issue of the transport of CRs, both parallel and perpendicular to the magnetic field and show that the issue of cosmic ray cross field transport is actually superdiffusive on scales less than the injection scale of turbulence. I shall demonstrate compressible fast modes are dominant cosmic ray scatterer from both quasilinear and nonlinear calculations. Implications for solar flares and interstellar medium shall be provided.

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       大样本恒星演化研究团组

　　中国科学院天体结构与演化重点实验室

　　云南天文台学术委员会

　　2013-10-15