One thing you do when in Lapland during the winter is to go out in the night and look up to the sky. And so I did. I also found an app (there are many) that given 30 min forecast of the northern lights: how weak or strong they are. It give time to get ready. Put the winter clothes on. Read a some blogs about the camera set up for taking photos of the Northern lights. Switch on the head torch and get out. There are northern lights every night, but they are never the same. I learned that they come in a scale from 0 to 9 (9 being very rare and being visible also in central Europe). So, I got out at nights during our trip to Pyhätunturi and look up at the sky. The first night they were barely visible. The second night they were a faint greenish cloud at the horizon. The third night they were a bit more visible, between 2.5 at the horizon. The last night they were up above our cottage. Like a cloud of fine dust, very high up in the sky, that moves along a wind stream and slowly changes shape as it moves.
At least one photo a day