would like to add that unless there is some sort of wave propogation in a medium not a vacuum you cannot have sound. Also the solar flares enter our atmosphere as electromagnetic radiation or light. there speed is the speed of light and not the speed of sound. thus energy= mc^2
in a recent article from the astrophysical journal dated oct1. it explains that when antimatter comes into contact with protons or electrons, the result is annihilation with the emmition of gamma rays containing a significant amount of energy directed in opposite directions.