They are characterized by coronal mass ejections on the sun's surface. The ejected ionized particles if thrown in the direction of the earth will cause bright aurora as they colide with the earth’s ionosphere and magnetic field. These solar storms can also affect telecommunications satellites and also electricity grid systems.
It asked for the name of explosions on the sun, and the only answer that sounds right is solar flares. It's in the name and is kind of self-explanatory... Hope this really helped someone out!!! ;D
