April 26, 2012 Auroras
Lake Winnibigoshish at Bena, MN
Looking overhead-south some miniature auroras well south of the main band. I've often seen these referred to as proton arcs. |
Non-contrast-enhanced version of the same image above. I underexposed the images a little with the camera. |
Main band of auroras near the northern horizon. |
More proton arc auroras overhead-south. |
Clouds move in on the main band. |