The solar winds that create the beautiful auroral lights that so many people enjoy can also cause severe problems that most people do not think about when they are watching the amazing colors painted in the sky. The truth is, solar winds are basically huge waves of ratiation flying through space. This can interfere with the operations of satellites and interrupt the functions of electric power grids on the ground.
When the radiation from solar flares sweeps past our planet electrons fall toward earth and create a current in the upper atmosphere called the auroral electrojet. The auroral electrojet can cause fluctuations in the geomagnetic field which can cause electrical surges in power lines on the ground.