The effect is caused the interaction between the [[solar wind]], the Earth's [[magnetic field]] and the upper [[atmosphere]]. Solar wind is composed of [[charged particle]]s, so the glancing particles in the particularly strong area of the magnetic field creates what seems like an electrical fireworks display.<ref>[http://solarsystem.nasa.gov/dictionary/index.cfm?Display=Dictionary&Letter=A NASA Dictionary].</ref> | The effect is caused the interaction between the [[solar wind]], the Earth's [[magnetic field]] and the upper [[atmosphere]]. Solar wind is composed of [[charged particle]]s, so the glancing particles in the particularly strong area of the magnetic field creates what seems like an electrical fireworks display.<ref>[http://solarsystem.nasa.gov/dictionary/index.cfm?Display=Dictionary&Letter=A NASA Dictionary].</ref> |