Aurora flames

Another kind of northern (de)lights. Auroras use to vary their forms, colours,
intensity, speed and length of time without any predictable pattern. So, you
never can know in advance what to wait for (if anything). If you are lucky, you
may catch something...
In last Saturday night I was lucky enough to have a more than half an hour
session with auroras before fog rose from the river liberating me to go to
bed. Result: more than 30 different exposures.
By the way, the lens was F2.8/10mm (Samyang).