Off topic - How the aurora borealis (northern lights) occur

This right here is a clip of what triggers the aurora borealis, more commonly known as the northern lights. Being brought up in norhern Sweden and my love for skiing as well as the outdoors have made me very aware of this natural phenomenon. Here´s a short ducumentary which explaines the phenomenon combined with unbelieveable photos from NASA: http://vimeo.com/25811412. Enjoy!