To see the northern lights in Colorado, a KP index of 5 or higher is usually needed. The KP index measures geomagnetic ...

Aspiring viewers of the Northern Lights are encouraged to go as far north as possible, away from light pollution, and face ...

which appeared as hazy colours in a brighter-than-usual night sky. It was a cool experience, he said, but he was surprised when he looked at cellphone photos taken the night before. “The colours ...