ИСТИНА

The Lomonosov satellite was launched into a 97.3-degree polar sun-synchronous orbit on April 28, 2016 and operated in orbit until December 2017. The satellite carried scientific instruments for studying the Earth's atmosphere, magnetosphere and cosmic rays, including the TUS detector. TUS detector is a highly sensitive telescope, designed for both detection of ultra-high-energy cosmic rays (with energies of 1020 eV) and investigation of the Earth's atmosphere UV radiation in the 240-400 nm range. The TUS telescope consists of two main parts. The first one is a mirror-concentrator with a total area of 2 m2. The second part is a photodetector, which consists of 256 pixels, located in the mirror focus. Each pixel of the photodetector is a photomultiplier tube (PMT), whose field of view is 10 mrad, which forms an area of 5 × 5 km2 on the Earth's surface. The field of view of the entire detector is 80 × 80 km2. The telescope has four operation modes with different time resolution (from 0.8 µs to 6.6 ms). This allows to measure atmospheric phenomena of different durations. The data obtained in the mode with a temporal resolution of 6.6 ms were analyzed in this work. The detector worked in this mode during three short periods of time in 2017. About 10,000 events were recorded during these periods on the night side. For the analysis of the glow in the auroral region, 2585 events recorded above 50 degrees north latitude were selected. Among the high-latitude events were identified 67 with unusual spatio-temporal structure, representing local glow pulsations in the field of view of the instrument. An analysis of geographical distribution was carried out and it was shown that the events are mainly located in the area of equatorial boundary of auroral oval (more than half of the events were registered on L-shells 4-6). During the registration of events, as a rule, there is an increased geomagnetic activity. Characteristic frequencies of pulsations of luminosity intensity are of the order of 1-10 Hz, and regions of pulsating luminosity are localized in the space with a characteristic size of 10-15 km.