Airglow over Italy . ... A 180 degree wide-angle panorama made in four exposures on August 24, the scene does look to the north and the sky is suffused with an eerie greenish light. Still, the subtle glowing bands are not aurorae, but airglow . Unlike aurorae powered by collisions with energetic charged particles and seen at high latitudes, airglow is due to chemiluminescence , the production of light in a chemical reaction, and found around the globe . ... NASA Official: Jay Norris. ...