Sampsa - Yes I'd be happy to jot down my learnings from aurora photography. I'll start a separate thread and cover off the major points that I have discovered along the way. Lapland should be an excellent place for viewing!
Here is a shot from yesterday. In the Rockies, the larch trees turn gold during September and eventually lose their needles (I think they are the only coniferous trees that do this). It makes for a wonderful show, and we always look for new places to see them. You generally need to hike above 2000 metres in elevation (which is about 500 metres above grade) to see them.