[en] A mechanism for the interaction of fast protons with a VLF wave in the inhomogeneous magnetospheric plasma is proposed to explain the observed features of stimulated precipitation ]R. A. Kovrazhkin et al., Pis'ma Zh. Eksp. Teor. Fiz. 39, 193 (1984) [JETP Lett. 39, 228 (1984)]]