Features of the Artificial Injection of Energetic Electrons from the Earth’s Radiation Belt into the Midlatitude Ionosphere and Their Dependence on Geophysical Conditions

— This paper presents the results of studies of the features of the injection of energetic electrons from the Earth’s radiation belt into the midlatitude ionosphere when the F 2 region of the ionosphere is modified by powerful HF radio waves emitted by the SURA heating facility. The measurements discussed in this paper were performed in 2019 using low-orbit ( h ≈ 850 km) NOAA -series satellites in the electron-energy range of 40–612 keV. The measurements were carried out in various geophysical conditions both above the SURA facility and in the magnetically conjugated ionosphere. In comparison with the previously obtained data from the DEMETER satellite, the performed studies made it possible to establish that, in a magnetic-flux tube with L ≈ 2.7, the most effective stimulation of the injection of energetic electrons takes place in the late evening and night hours, while the lower effective takes place in daytime conditions. The intensity of injection strongly depends on the degree of filling the radiation belt with energetic electrons. The energy introduced into the ionosphere by the injected energetic electrons is estimated. Examples of their possible influence on both generation of artificial ionospheric turbulence and atmospheric processes are given.