A strong solar flare from an active region of the sun caused a dramatic display of the aurora borealis (northern lights) and aurora australis (southern lights). The solar flare sent a cloud of gas and charged particles called a coronal mass ejection, or CME, at the Earth. The flare’s collision with the Earth’s magnetic field causes the brilliant light displays.

The sun has a cycle 11 years long. We are now in the part of the cycle where the sun’s activity is higher. Scientists predict that we will continue to see this kind of intense auroras as the sun’s activity increases, reaching what is known as solar maximum next year.

See more pictures of this week’s auroras on National Geographic News.

See pictures of the sun on National Geographic Kids.

Photograph by Thilo Bubek