ИСТИНА

The TUS detector was launched in April 2016 aboard the Lomonosov satellite. The device is designed to register the fluorescent signal of extensive air showers (EAS) from ultra-high-energy cosmic rays in the wavelength range of 300-400 nm. EAS fluorescence is a weak and rapidly moving signal in the field of view of the detector; therefore, the TUS detector is a highly sensitive mirror telescope with an entrance pupil area of 2 m2 and high temporal resolution (0.8 μs). The field of view of the device is 6400 km2, the angular resolution is 10 mrad, which corresponds to a 5x5 km square on the Earth's surface. The Lomonosov satellite has a polar solar-synchronous orbit with an inclination of 97.6°, which allows measurements up to the highest latitudes on the night side of the orbit. The detector electronics implements several operating modes that differ in time resolution (from 0.8 μs to 6.6 ms) and allows recording optical phenomena of different time scales. In this work, we analyze the UV glow in the polar regions of the northern hemisphere (60° - 80° N), carried out in a mode with a temporal resolution of 6.6 ms and a waveform duration of 1.7 s. About 1200 observations were analyzed in a wide range of longitudes. A selection was made of events in which the spatio-temporal dynamics of the signal is observed, while events related to anthropogenic glow (cities) and oscillograms in which the signal represents statistical fluctuations of stationary noise are discarded. An analysis is made of the location of the selected events relative to the auroral oval, the observed spatiotemporal structures depending on the geomagnetic situation, and the characteristic spatial and temporal scales of the regions of increased UV glow are determined.