A minor aurora display, May 25, 2013, though bright enough to show up under full moonlight and over the city lights to the north, as seen from the Rothney Astrophysical Observatory near Calgary, Alberta. This was at the May 25 Open House and ended the evening viewing. This is a 20 second exposure at f/4 and ISO 800 with the Canon 10-22mm lens and Canon 60Da.
The Amazing Sky 