The Aurora Borealis (or Aurora Australis) can make beautiful images.
You best best is to choose
a camera with low noise, like the Nikon D3s (see the
review in DAP); this allows shorter exposures with still very low noise, important
for such beautiful smooth color.
You must use a tripod, and don’t be discouraged by just what you can see; I could see very little
color in these images, but the camera certainly could. Exposures typically were in the 2-30 second range at ISO 200 or
so.
You can liven up some scenes by lighting the foreground. For the image below I used the Lupine
Wilma, powerful enough to illuminate the trees and antlers.
Aurora Borealis with Antlers, Whitefish Lake, Canada