It hasn't been really dark when the Northern Lights appeared. You still can see some sunlight at the horizon. The image was taken on a small beach just outside the city of Tromsø, a place called Rekvik. The island in the background is called Sessøya.
Canon 5D3 - 15mm fisheye - ISO1600 - f/2.8 - 2sec
Location: Northern Norway - Rekvik
Photographer: Alfred Lucas