Astronaut Christina Koch captured from ISS aurora or the northern lights.
— Christina H Koch (@Astro_Christina) December 6, 2019
An aurora, referred to as polar lights, northern lights, and southern lights, is a natural light display in the Earth’s sky, predominantly seen in the high-latitude regions (around the Arctic and Antarctic). Auroras are the result of disturbances in the magnetosphere caused by solar wind. These disturbances are regularly strong enough to alter the trajectories of charged particles in both solar wind and magnetospheric plasma. These particles, mainly electrons and protons, precipitate into the upper atmosphere (thermosphere/exosphere). The resulting ionization and excitation of atmospheric constituents emits light of varying color and complexity.