Ionized-air glow

Nitrogen glow
Oxygen glow
Electrical discharge in air
Particle beam from a cyclotron

Ionized-air glow is the luminescent emission of characteristic blue–purple–violet light, often of a color called electric blue, by air subjected to an energy flux either directly or indirectly from solar radiation.[1]

  1. ^ "Airglow". www.albany.edu. Retrieved 13 December 2021.