Аннотация:High-altitude balloon (Nataliia) data concerning fluxes of high-energy electrons (10-15 MeV) and protons (100-350 MeV) are examined, and the formation of an additional flux of precipitating particles due to scattering by ELF MHD waves is discussed. The results indicate that fluxes of quasi-trapped high-energy particles at the L = 2 shell are highly variable, and that mechanisms for the sufficiently rapid pumping of particles at the L = 2 magnetic shells may exist.