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It is shown that the dynamics of particles in the field of a wave packet, whose group velocity is zero, is almost always chaotic. Earlier we showed that in the field of a large number of cyclotron resonances, the higher moments of particle dynamics can be much larger than the lower moments. A kinetic description of such dynamics can be realized only on the basis of the generalized Fokker-Planck equation. Such an equation is obtained. Some features that appear as a result of taking into account the higher moments are described. PACS: 05.10.Gg; 05.45.-a