One more photo to submit of the Aurora. They were brillian with lots of greens and purples (which I've neer seen in the Aurora before). These were much better than the Aurora I photographed in March 2010. These ones lasted from just after 10pm CST to almost midnight CST. Photo taken with Canon 40D with Tokina 10-17mm fisheye lens; ISO 1600, 20s exp, f/3.5, focal length 10mm.