We were just a few miles north of Fairbank,Ak.
I use a 15 second exposure on iso 200 Extochrome slide film. Wrap camera in down jacket or blanket as soon as you get in the house so camera will warm up slowly.
Lots of Northern Lights in Fairbanks in the winter. photo taken outside my home. temperature -40 Below. Northern Lights constantly moving and you can hear the lights crackelling. Very impressive.