http://www.newsweek.com/photos-northern-lights-caused-solar-geomagnetic-storm-cme-sunday-1687609

Earth experienced a geomagnetic storm over the weekend, causing auroras that wowed people across Scandinavia and as far south as the U.K.

Geomagnetic storms are the result of charged particles that arrive at Earth after being ejected from the sun at such high speeds that they can take just a couple of days to get here.