Monday night there was a spectacular aurora show here. Yesterday was forecast the same , 8.5/10 on the aurora activity level, and I haven't seen it that high since I have lived here for about 3 years now. Usually its 5-6.5. Anyway last night was cloudy otherwise I would have gone out and waited for the aurora to take some photos myself.
Living in northern Canada we see aurora almost every night when it is dark enough to see them that is.
My favorite time to photograph aurora is in late August and early September. The lakes are not frozen and the reflections off the water are beautiful , and its not -30 C its still above zero so it doesn't hurt your face to go outside.
It was actually the aurora that got me into buying a Nikon DSLR in the first place, trying to capture them in photos with phone camera or P&S is futile!
I took this last August, with Nikon D7100 and using the Tokina 11-16mm/2.8.
I have sold the Tokina 11-16mm now but have bought a 20mm/1.8G. I can't wait to try it with my Df. The 20mm with the Df should let me decrease the exposure time by quite a bit. Since aurora can move and change quickly it will be nice to have a shorter exposure.