The Suomi-NPP satellite took this picture of North America at night on 8 October. The waves that seem to be rolling across Quebec and Ontario in the upper half of the image are the Aurora Borealis or northern lights. The impressive aurorae seen during the past few days are caused by strong geomagnetic storms triggered by a solar coronal mass ejection on 4 and 5 October striking Earth’s magnetic field three days later. The curtains of light, are formed as charged particles accelerated in the magnetosphere excite oxygen and nitrogen in the upper atmosphere.
Image Credit: NASA