时间：2022-12-03 19:00
地点：ZOOM：95150896241 密码：289633
报告人：Huirong Yan 教授/首席科学家
主持人：刘四明教授
时间：2022年12月3日（周六）19：00
ZOOM：95150896241
入会密码：289633
题目：Magnetohydrodynamic Turbulence and Cosmic Ray Transport
主讲人：Huirong Yan professor/ Leading Scientist
2015 - present W3 chair professor at Institut für Physik und Astronomie, Universität Potsdam; and Leading Scientist at DESY Zeuthen
2009 – 2015 Research Professor, Kavli Institute for Astronomy & Astrophysics, Peking University
2008 - 2010 Theoretical Astrophysics Program Prize Fellow, U Arizona
2005- 2008 Postdoctoral Fellow, Canadian Institute of Theoretical Astrophysics (CITA), Toronto
2005.8 PHD Dept. of Astronomy/ University of Wisconsin-Madison/ Unites States of America
2002.6 M.Sc. Dept. of Astronomy/ University of Wisconsin-Madison/ Unites States of America
1998 .7 B.Sc. Astrophysics at Peking University/ China
Current research interests
Turbulence and Plasma Astrophysics Space physics
Cosmic Ray and High Energy Astrophysics
nterstellar medium
Plasma instabilities and their Astrophysical Implications
Atomic alignment and Astrophysical Magnetic Fields
Physics of Interstellar and Circumstellar Dust
Awards
2019.8-9 Visiting scholarship, KITP program “Multiscale Phenomena in Plasma Astrophysics”,USA
2013 Helmholtz Distinguished Professorship
2013 - 2014 Labex scholarship, France
2012 - 2015 Winner of Templeton senior grant from Beyond the Horizons program: Grants for Research on Big Questions in Astronomy, Astrophysics and Cosmology sponsored by Templeton foundation (US) and Chinese Academy of Science
2012 Visiting Professorship, International Institute of Physics, Brazil (3 months)
2012.1 Visiting Professorship, GCOE Program, Nagoya University, Japan
Abstract
Cosmic ray propagation is determined by the properties of interstellar turbulence. The multiphase nature of ISM and diversity of driving mechanisms give rise to spatial variation of
turbulence properties. A new chapter of CR propagation research has begun when studies of particle transport and interstellar turbulence can confront each other. I shall report our current
understandings of MHD turbulence and particle transport. In particular, the proportion of magnetosonic modes is revealed to increase with increasing compressive forcing from
turbulence simulations, which entails an extra spatial dependence of cosmic rays transport.Both theoretical and observational studies will be presented. With the advanced technique we developed, it is found that Alfven and magnetosonic modes are distinguishable from observations. Clear signatures of critically balanced turbulence as well as the compressible modes are revealed from space/astro plasma in conjunction with the behavior of particle transport. Different regimes of particle transport, e.g., diffusion vs. superdiffusion, isotropicvs. anisotropic diffusion, will be discussed in relation to turbulence properties
