Airglow

Airglow is a faint luminous phenomenon in Earth's atmosphere caused by chemical reactions among gases high above the surface, primarily during nighttime. These reactions, triggered by solar UV radiation during the day, cause atoms and molecules to emit light as they return to their normal state. This natural glow is different from the brighter auroras and is visible as a subtle, blanket-like shimmer across the night sky. Airglow provides valuable information about the composition and behavior of the upper atmosphere and is a continuous, gentle light that contributes to the overall beauty of the night sky.