University of Maryland
Atlantic Building, Room 2400
4:30 PM Monday, February 8, 2016
Coffee, Tea & Snacks 4:15-4:30 PM

Ryun-Young Kwon
George Mason University and The Johns Hopkins University Applied Physics Laboratory
The role of solar supernova-shaped shock waves in longitudinal properties of widespread solar energetic particle events

We discuss how and where the solar energetic particles (SEPs) are accelerated by the solar eruptions and how SEPs injected with a single flare-coronal mass ejection (CME) event reach a wide range of heliospheric longitude and latitude. It has been found recently by the presenter that halo CMEs are supernova-shaped fast magnetosonic shock waves. The shock waves propagate all around the Sun and form the spherically shaped fronts enclosing the Sun. We investigated the three-dimensional geometries of the shock waves and compared them with longitudinal properties of widespread SEPs, using a number of spacecraft distributed in the inner heliosphere over a broad range of heliolongitudes. We argue that the supernova-shaped shock waves played a fundamental role in the injection of SEPs, and the geometries of the shocks were responsible for the properties of SEPs detected at different longitudes.

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.