What a beautiful picture of an Aurora. I first learned of this phenomenon during Solar Physics in graduate school. An aurora - from the Latin word aurora, meaning "dawn", is a natural light display in the sky particularly in the high latitude (Arctic and Antarctic) regions. This luminous event is caused by the collision of energetic charged particles with atoms in the high altitude atmosphere (thermosphere). The charged particles originate in the magnetosphere and solar wind and, on Earth, are directed by the Earth's magnetic field into the atmosphere.