Tracking Ultraviolet Set-up (TUS) on board the Lomonosov satellite measured the UV intensity pulsations in the auroral region. Sixty-four events with pulsations were registered during two measurement periods from 26 December 2016–10 January 2017 and 8–15 November 2017. During both periods, a high-intensity, long-duration, continuous auroral activity (HILDCAA) was detected. Simultaneous measurements in LEO by Lomonosov (DEPRON detector) and Meteor-M2 satellites show the enhanced fluxes of the trapped and precipitated energetic electrons in the region of the Earth’s outer radiation belt during these periods. We found that most of the UV-events correspond to energetic electron (E > 100 keV) precipitation. One can suggest that particles of these and higher energies cause a pulsating emission relatively deep in the atmosphere.

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Abstract— The first results of monitoring the radiation state of the near-Earth space on the Arktika-M no. 1 spacecraft in a high-apogee Molniya orbit are considered. The characteristics of the devices of the heliogeophysical instrumentation complex GGAK-HE are presented. The results of the comparative analysis of experimental and model distributions of energetic particle fluxes of the Earth’s radiation belts in the orbit of the Arktika-M no. 1, as well as of some features of the dynamics of the outer electron radiation belt in 2021 and 2022 and the solar proton event of October 28, 2021, based on the experimental data from Arktika-M no. 1, Meteor-M no. 2, and Elektro-L no. 2 spacecraft are presented.

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