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In the present paper we investigate the resonant interaction between monochromatic electromagneticwaves and charged particles in configurations with magnetic field reversals (e.g., in the earthmagnetotail). The smallness of certain physical parameters allows us to solve this problem usingperturbation theory, reducing the problem of resonant wave–particle interaction to the analysis ofslow passages of a particle through a resonance. We discuss in detail two of the most importantresonant phenomena: capture into resonance and scattering on resonance. We show that theseprocesses result in destruction of the adiabatic invariants and chaotization of particles; theyalso may lead to significant (almost free) acceleration of particles and may govern transport in thephase space. We calculate the characteristic times of mixing due to resonant effects and separatrixcrossings, and discuss the relative importance of these phenomena.

Resonances and Particle Stochastization in Nonhomogeneous Electromagnetic Fields