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Spacecraft observations show that energetic ions are found in the Earth's\udmagnetotail, with energies ranging from tens of keV to a few hundreds of keV.\udIn this paper we carry out test particle simulations in which protons and\udother ion species are injected in the Vlasov magnetic field configurations\udobtained by Catapano et al. (2015). These configurations represent solutions of a\udgeneralized Harris model, which well describes the observed profiles in the\udmagnetotail. In addition, three-dimensional time-dependent stochastic\udelectromagnetic perturbations are included in the simulation box, so that the\udion acceleration process is studied while varying the equilibrium magnetic\udfield profile and the ion species. We find that proton energies of the order\udof 100 keV are reached with simulation parameters typical of the Earth's\udmagnetotail. By changing the ion mass and charge, we can study the acceleration\udof heavy ions such as He+ +  and O+, and it is found that energies\udof the order of 100–200 keV are reached in a few seconds for He+ + , and\udabout 100 keV for O+

Proton and heavy ion acceleration by stochastic fluctuations in the Earth's magnetotail