ИСТИНА

Relativistic electron microbursts (REMs) are intense pulses of electron precipitation that typically last near 100 ms. First indirect measurements of microbursts were done by balloon-borne registration of bremsstrahlung X-rays in auroral zone and later have been studied in detail in satellite experiment SAMPEX. REM usually appear as clusters or series of sharp peaks. Microbursts in near-UV (300-400 nm) wavelength range with a similar temporal structure were observed by the PAIPS project photometers. PAIPS (Pulsating Aurora Imaging System ) is being deployed at the Kola peninsula and is aimed to conduct stereo measurements of pulsating aurora (PsA) with high temporal resolution (1 ms). Imaging photometers allow to determine the spatial structure of emission and it was shown that microburst can take the form of local spots, arches, and extensive diffuse glow spots, arcs and diffuse glow. UV-microbursts are observed at various geomagnetic activity conditions, mainly during during the substorm recovery phase. In this work we present the results of the search and analysis of the spatio-temporal structure of UV-microbursts, comparison with satellite measurements of relativistic electrons and all-sky cameras of Polar Geophysical Institute. This research was funded by Russian Science Foundation grant number 22-62-00010 (https://rscf.ru/project/22-62-00010/).