Légende : Auroras are also known as the Northern Lights. They are due to the solar wind coming from the Sun and stopped by the Earth magnetic field. They can show up in different colors depending of the altitude : green being the most common, they can be pink, red, yellow blue or white.
You can witness these wonders of nature from September to April in Iceland.
As the photo can't show, they are not moving really fast (just like clouds moving in the wind), so you have time to take photos. But don't forget : it is cold and you'll have to take long exposure shots with a tripod. The hardest part for me was having a sharp focus on the foreground (the autofocus don't work in the dark).