Click on thumbnails for larger version (thumbnails show shape of larger version, not size). These photos have been adjusted in Photoshop, especially to get rid of some of the annoying red hue from the city lights. Hence the difference in background color. This auroral display came out of nowhere. The sky had been blank only minutes before it peaked, so the best part was already over before I got my equipment up and ready. The two big buildings appearing in many photos are IARC (International Arctic Research Center, the lower one with the dome on top) and Geophysical Institute (has big dish w. red lights on top). The temperature was probably close to -35C, and under these quiet, cold conditions the air over Fairbanks is caught under an extremely stable inversion layer. At this time, the temperature down in the valley was lower than -35C while those living in the hills might enjoy temperatures around -20C - -25C. The result can be seen in the panorama view over Fairbanks above. The moist outlets from stoves around town and especially from power plants rise only a short distance, and since the cold air can't contain much water vapor, Fairbanks is shrouded under ice fog. When it gets under -40C, the ice fog can become really dense. I've seen visibilities less than 25m, and I'm sure I've not seen nearly the worst. Obviously, air pollution becomes a major problem too. Occasionally a CO-warning (carbon monoxide) is issued, and people with wood stoves as secondary heat sources are banned from using these.