Worst case EMP scenario? Half in U.S. dead
Along with the radiation from the flares, there also is a coronal mass ejection, or CME. During a CME, billions of tons of highly charged particles are ejected to interact with Earth’s magnetic field, causing radio blackouts and the shutdown or destruction of vulnerable electrical grid systems and sensitive electronic components.

Coronal Hole
A hole in the sun’s atmosphere–a “coronal hole”–has opened up and it is spewing solar wind into space. The impact could spark geomagnetic storms and auroras around the poles.