Aurora!
Northern Lights @Iceland.
An aurora, also known as polar lights or northern lights, is a natural light display in the sky, predominantly seen in the Arctic and Antarctic regions. Auroras are produced when the magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in both solar wind and magnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere, where their energy is lost. The resulting ionization and excitation of atmospheric constituents emits light of varying colour and complexity.
