Bursts of energetic electron and proton precipitation from the magnetosphere and artifically stimulated by a powerful ground-based Soviet VLF emitter (F=19.1 kHz, L=4.0) were detected during the ESSA experiment aboard the AUREOL-3 satellite (ARCAD-3 project) at altitudes of 1500-2000 km in the MLT morning sector. Stimulated electron and proton precipitations were clearly recorded in 7 overpasses out of 17 during the period 1-25 December 1981. The precipitation zone corresponded to the projection on the ionosphere of the ring current region (L=2.8 to 3.6), and was displaced equatorward with respect to the location of the VLF transmitter. The intensities of the artificial 0.1-2 keV electron fluxes ranged from 104 to 105 (cm2 sec ster keV)-1 and those of the 60-220 keV protons form 100 to 102 (cm2 sec ster keV)-1. The 1.8 keV electron bursts were delayed by about 1 sec with respect to the VLF pulses, and the 110 keV proton fluxes were delayed by about 3-5 sec. Results are discussed in terms of both Cerenkov and cyclotron resonance effects between VLF nonducted waves and magnetospheric particles.