Gamma
27 March, 2004
Aurora Borealis (Northern Lights) appears over Coal Lake. Solar particles emitted during large explosions and flares on the sun's surface, collide with gases in the Earth's atmosphere. The energy resulting from the interaction between this 'solar wind' (as it is known) and molecules in the atmosphere is emitted in the form of photons - and many such individual collisions appear to make the aurora move across the sky, creating a spectacular natural light display.
