Also known as northern lights.
1) In scientific terms, it is cause by ions within the atmosphere getting excited from the energy released by the
sun. During the state of excitement, the ions release those energy in order to stabilize themselves. Those energy
bear different colors, which depends on the composition of the ions. (i.e. oxygen, nitrogen, carbon, etc.)
2) In common terms, pretty lights in the
sky that can only be
seen at the northern regions of the globe.