ИСТИНА

Since 2018, Skobeltsyn Institute of Nuclear Physics of Moscow State University has been developed a series of compact UV detectors for space missions called «AURA» (AURA - Atmospheric Ultraviolet RAdiation). The purpose of the experiment is to observe the glow of the night atmosphere. The main feature of these detectors is the use of silicon photomultipliers (SiPM), which have small size, low supply voltage, and high reliability. It makes these photo sensors suitable for use in board nano satellites. The second detector in the «AURA» series, the AURA-2, is currently operates on board the DEKART satellite. This detector version has a higher time resolution (10 ms) and wider field of view (22×90 degrees) in comparison with AURA-1 used on board the VDNH-80 satellite. Two successful sessions of measurements of the night atmosphere glow were carried out: in September and December 2021. A number of fast UV flashes above thunderstorm regions were measured. They were registered northeast of Papua New Guinea and their characteristic duration was tens of milliseconds. The temporal structure and intensity in different channels were analyzed in order to understand nature of events. Thunderstorm activity in the detection area was also studied. The results of AURA-2 detector data processing and preliminary analysis will be presented in the talk.