Got some fairly strong northern lights last night a bit further south than I'm used to. Happens from time to time but not very often. I've also flown a lot at a bit more nothern latitudes, above the arctic circle and such. Used to seeing them a fair bit there but they normally start around N62/N63. Started as a large aurora oval coming down close to Stockholm latitude and got more active an hour later. But no disturbances, just a good show.