ИСТИНА

The TUS telescope on board the Lomonosov satellite in the 500 km altitude orbit carried out observations of UV emission of the Earth’s atmosphere with micro and millisecond temporal resolution during 2016-2017. During two series of measurement in December 2016 - January 2017 and November 2017, a total of 64 events of the near UV (NUV) glow pulsations in the sub-auroral region were registered. Simultaneously, DEPRON detector of Lomonosov satellite measured the fluxes of energetic particles. The both periods were associated with recovery phase of the moderate magnetic storms. Prolonged auroral activity during these periods give us an opportunity to consider them as HILDCAA (high-intensity, long-duration, continuous AE activity) events. Complementary measurements of the wave electric and magnetic field by EMFSIS instrument of Van Allen Probes satellites give evidence of electrons pitch-angle scattering by VLF waves in the near-equatorial region. Charged particle fluxes measurement conducted by two orthogonal detectors on board METEOR-M2 satellite found intense precipitation of the electrons with energies 100-700 keV. The most of the NUV events occur either on the maximum of the outer radiation belt or in the high-latitude auroral region of quasi-trapped energetic particles (more than 100 keV). Multi-satellite measurements show that NUV pulsations appear as a result of prolonged geomagnetic activity that is responsible for outer radiation belt electrons acceleration and scattering by VLF waves and precipitation in the Earth’s atmosphere.