Creature Aurora Over Norway

It was Halloween and the sky looked like a creature. Exactly which creature, the astrophotographer was unsure but ( possibly you can suggest one ). Exactly what caused this eerie apparition in 2013 was sure: one of the best auroral displays in recent years. This spectacular aurora had an unusually high degree of detail . Pictured here , the vivid green and purple auroral colors are caused by high atmospheric oxygen and nitrogen reacting to a burst of incoming electrons . Birch trees in Troms , Norway formed an also eerie foreground . Recently, new photogenic auroras have accompanied new geomagnetic storms .