Aurora Borealis purple red blue green Arctic

After a lifetime of study, aurora still a mystery

Ned Rozell for UAFGI – Sometimes, after idling in the sky for hours as a greenish glow, the aurora catches fire, erupting toward the magnetic north pole in magnificent chaos that can last for three hours. “Substorms,” as space physicists call them, can happen two or three times each night. The man who came up […]