Shot at Gullfoss waterfall in Iceland at 9:15 PM.  Camera mounted on a tripod in manual mode.  Lense is a sigma set to 18mm, f/1.8, Exposure 2 sec. and ISO-3200.  The trick is to shoot fast enough so the Aroura does not move while the photo is being shot.   To long and you lose definition.  Both foreground and Aroura shot in the same frame.   Foreground exposure brightened in Lightroom