Altitude distribution analysis of electron fluxes at L = 1.2–1.8 Original Research Article

In this work, we present the investigation of experimental data of electron fluxes with energies Ee = 30–480 keV at L = 1.2–1.8 in wide altitude interval from 500 up to 1500 km. The data were obtained on ACTIVE satellite (“Intercosmos-24” in 1989–1990, altitudes from 500 up to 2500 km). Also, we analyze the distribution of electron fluxes with energies Ee = 0.3–1.0 MeV obtained onboard MIR station (SPRUT-VI experiment in 1999, altitudes from 350 up to 400 km). The comparison with results obtained onboard other satellites reveals that the borders of electron registration zones under the radiation belts of the Earth at middle latitudes coincide. The shape of these zones is stable in time and space. It can be explained by existence of unknown constantly working mechanism of particle precipitation. It is possible, that electron fluxes at L = 1.6–1.8 are caused by ground-based radiotransmitters (e.g., Nagata, K., Kohno, T., Murakami, H., et al. Electron (0.19–3.2 MeV) and proton (0.58–35 MeV) precipitations observed by OHZORA satellite at low zones L = 1.6–1.8. Planet. Space Sci. 36, 591, 1988).