The Incredible Northern Lights, Aurora Borealis

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An aurora, sometimes referred to as a polar light, is a natural light display in the sky, predominantly seen in the high latitude (Arctic and Antarctic) regions.[a]Auroras are produced when the magnetosphere is sufficiently disturbed by thesolar wind that the trajectories of charged particles in both solar wind andmagnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere (thermosphere/exosphere), where their energy is lost. The resulting ionization and excitation of atmospheric constituents emits light of varying colour and complexity. source

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