Interpretation of the 12 May 2012 ground level enhancement event

Murray Dryer, Ph.D., Organization Not Listed, Washington, DC, United States, Chin-Chun Wu, US Naval Research Laboratory, Washington, DC, United States, Kan Liou, JHU/Applied Physics Lab, Laurel, MD, United States and Shi Tsan Wu, University of Alabama in Huntsville, Huntsville, AL, United States