• Faint glow in the night sky caused by fluorescence of air molecules in the upper atmosphere. The air at this height glows as the result of interaction with solar radiation, especially when ultraviolet radiation from the Sun forms nitrogen oxides with the emission of visible light. The airglow can exist at 600km or more above the Earth’s surface. Although interesting in its own right, the Airglow can also hamper other astronomical observations.

Not what you were looking for?