University of Maryland
Atlantic Building, Room 2400
4:30 PM Monday, September 30, 2013
Coffee, Tea & Snacks 4:15-4:30 PM

Don Ellison
North Carolina State University
Particle Acceleration in Supernova Remnant Shocks

Diffusive shock acceleration (DSA) has been intensively investigated since its introduction in 1976-78. One of the more amazing aspects of this theory is that there are still interesting unsolved problems after 35 years of work. Diffusive shock acceleration is difficult to fully characterize because it is intrinsically efficient and therefore nonlinear. I will give an overview of nonlinear DSA including shock smoothing, magnetic field amplification, and particle escape. In many ways, supernova remnants (SNRs) are the most interesting and fruitful objects for studying DSA. Besides almost certainly being the main source for the bulk of galactic cosmic rays (CRs), the broadband radiation observed from individual SNRs gives the most complete picture of particle acceleration available. I will describe the application of a nonlinear model of DSA to CR production in specific SNRs including SNR RX J1713 and Vela Jr.

Sponsored by: Department of Physics and the Institute for Physical Science and Technology, University of Maryland. For information call Catha Stewart 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.