BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:UW-Madison-Physics-Events BEGIN:VEVENT SEQUENCE:0 UID:UW-Physics-Event-3848 DTSTART:20151110T180000Z DTEND:20151110T190000Z DTSTAMP:20260306T235600Z LAST-MODIFIED:20151106T150217Z LOCATION:4421 Sterling Hall\, NOON TALK SUMMARY:Cosmic Ray Transport in MHD Turbulence\, Astronomy Colloquium\ , Huirong Yan\, Max-Planck Institute DESCRIPTION:Recent advances in MHD turbulence call for revisions in th e paradigm of cosmic ray transport. I would like to clarify some outst anding issues related to particle transport in realistic turbulent ast rophysical environments. We have carried out both analytical and nume rical studies aiming at a theory-justified picture of the acceleration and transport processes based on the numerically confirmed modern the ory of MHD turbulence. I shall address the issue of the transport of C Rs\, both parallel and perpendicular to the magnetic field and show th at demonstrate that cosmic ray transport is medium dependent since com pressible fast modes dominate the interactions. I shall also address t he issue of perpendicular to the magnetic field and show that cosmic r ay cross field transport is diffusive on large scales and super diffus ive on scales less than the injection scale of turbulence. Implicatio ns for Galactic cosmic ray propagation and shock acceleration will be presented. Last but not least\, the CR transport in molecular clouds s hall be briefly discussed.
\n URL:https://www.physics.wisc.edu/events/?id=3848 END:VEVENT END:VCALENDAR