Latitudinal profile of UV nightglow and electron precipitations

► Enhancements of 300-400 nm UV nightglow observed by a satellite are analyzed. ► High-latitude UV enhancements result from electron precipitation from radiation belt and aurora. ► At low latitudes, the UV emission is attributed to the bulges of mesospheric oxygen. ► Mid-latitude UV enhancements are co-located with regions of electron precipitation. ► The intensity of precipitation is found to be too small to produce the observed UV emission. That is a subject of further studies.