University of Maryland
Atlantic Building, Room 2400
4:30 PM Monday, September 15, 2008
Coffee, Tea & Snacks 4:15-4:30 PM

Vladimir Ptuskin
Supernova Remnants as Cosmic Ray Accelerators

Most of galactic cosmic rays are thought to be accelerated in supernova remnants by the diffusive shock acceleration mechanism. The data on cosmic rays at the Earth and the observation of non-thermal radiation from supernova remnants testify that the particles are accelerated with high efficiency and in a wide range of energies. We discuss the acceleration of ions and electrons by supernova shocks in a general context of the problem of cosmic ray origin. The emphasis is on the determination of the energy limit for galactic sources, the average source spectrum of galactic cosmic rays, and the transition from galactic to extragalactic cosmic-ray component.

Sponsored by: Department of Physics and the Institute for Physical Science and Technology, University of Maryland. For information call Victoria at (301) 405-4811 or go to the UMD Space Physics group seminar web site.

There is free parking after 4:00 PM in lot B (the big parking garage across the street from the ATL building). There are a limited number of spaces in lot Q next to the new ATL wing with free parking after 4PM even when there is a basketball game on campus.