11:00 AM - 11:15 AM
[PEM19-02] Second order Fermi acceleration of ions in the earth's foreshock: wave dispersion effects
Keywords:second order fermi acceleration, particle acceleration and energy diffusion, wave dispersion
In this presentation, we discuss the second order Fermi process by performing test particle simulations, paying particular attention to the effects of finite wave dispersion on the ion acceleration efficiency. We consider the right- and left-hand polarized electromagnetic waves, with both parallel and anti-parallel propagation directions along the background magnetic field. A power-law spectrum of each wave component is assumed. The waves obey the cold plasma dispersion relation. We evaluate the acceleration efficiency as a function of the initial ion kinetic energy. We will discuss implications of our results to Cluster observations (Kis et al., 2004).