ИСТИНА

The global distribution of sub-relativistic electron fluxes was measured in the RELEC experiment on-board Vernov space mission. The Vernov satellite was launched on July 8, 2014, into a sun-synchronous semi-circular orbit with an altitude of apogee of 830 km. The RELEC payload included a hard X-ray, gamma-ray and electron spectrometer (DRGE) including four high-sensitivity NaI(Tl)/CsI(Tl) scintillator spectrometers with a total area of ~500 cm^2 directed to the Nadir and providing detection of gamma quanta in the range from 10 keV to 3 MeV and electrons with energies 0.05 – 15 MeV, as well as an electron spectrometer (0.2-10.0 MeV), including three mutually orthogonal detectors, each with ~2 cm^2*sr geometric factor, allowed estimation of the pitch-angular distribution and identified precipitating particles. A continuous recording of the counting rate of the detected particles and quanta with a time resolution of 1s was provided, and a recording of the energy and detection time of each gamma-quantum (or electron) with a ~15 μs resolution (so-called “event by event mode”) was also realized. This allows not only to carry out a detailed analysis of the dynamics of the particle fluxes but also to compare the time profiles with data from other RELEC instruments, in particular, detectors of very low frequency (VLF) electromagnetic waves. As the result, distribution of electron fluxes together with VLF-waves was obtained at different L-shells and different areas of near-Earth space.