Charged Particle Motion in Temporal Chaotic and SpatiotemporalChaotic Fields

We investigated charged particle motion in temporal chaotic and spatiotemporal chaotic field. In its steady wave frame a few key modes of the solution of the driven/damped nonlinear wave equation are used as the field. It is found that in the spatiotemporal chaotic field the particle drifts relative to the steady wave, in contrast to that in the temporal chaotic field where the particle motion is localized in a trough of the wave field. The result is of significance for understanding stochastic acceleration of particles.