ИСТИНА

This work investigates the impact of geomagnetic and solar activity on relativistic (with energies >700 keV) electron precipitation (REP) events, observed in the auroral and subauroral regions at altitudes of ~850 km (based on NOAA/POES and MetOP satellite data). Two years were selected for analysis, one (2017) with low and the other (2023) with high solar activity. Catalogues of events were compiled for these two periods when relativistic electron precipitation (REP) was observed near the Lovozero observatory and its magnetically conjugate region in the Southern Hemisphere. The vicinity of the observatory was defined as a longitudinal sector extending 75° in magnetic longitude; this area was chosen to correlate precipitation with ground-based observations of VLF waves and Pc1 geomagnetic pulsations. In the obtained catalogues, the events were classified into three groups according to the criterion presented in the works [1, 2]. Each group in this classification has distinct formation mechanisms. We analyze the occurrence rates of REP events and the fluxes of both trapped and precipitating energetic electrons within each group, examining their dependence on solar wind parameters (e.g., velocity, IMF Bz) and geomagnetic conditions (Kp, Dst, and AE indices) during high and low solar activity phases.