UV Radiation from the Night-Time Atmosphere seen from the “Universitetsky-Tatiana” Satellite

Detectors on the “Universitetsky‐Tatiana” satellite measured a smoothly varying intensity of UV radiation from the night‐time atmosphere in the nadirdirection and the intensity of the energetic electron flux at the orbit. At high latitudesthe UV intensity in the auroral oval is interpreted as being due to electrons penetrating into the atmosphere. At middle latitudesthe UV intensity is an order of magnitude less and more data are needed to reveal the origin of this radiation. Millisecondflashes of UV radiation were observed. The flashes’ energy, temporal profile and global distribution are similar to these parameters for Transient Luminous Events (TLEs). These studies will be continued aboard the next satellite “Tatiana‐2”.