Swarm Helps Discover Steve's Long-Lost Twin

Images of Ion Stream Captured by Digital Cameras

Ever since aurora chasers discovered "Steve", a mysterious ribbon of purple light in the night sky, scientists have wondered whether it might have a secret twin. Now, thanks to a photographer’s keen eye, and data from ESA’s Swarm satellites, it may have been found.

“It has been amazing to have contributed to new science and help scientists uncover this p…