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Energetic particles with energies from tens of keV to a few hundred keV are frequently observed in the Earth's magnetotail. Here we study, by means of a test particle numerical simulation, the acceleration of different ion species (H + , He + , He ++ , and O  n +  with  n  = 1–6) in the presence of transient electromagnetic perturbations. All the considered ions develop power law tails at high energies, except for O +  ions. This is strongly correlated to the time that the particle spends in the current sheet. Ion acceleration is found to be proportional to the charge state, while it grows in a weaker way with the ion mass. We find that O 5+/6+  can reach energies higher than 500 keV. These results may explain the strong oxygen acceleration observed in the magnetotail.

Charge Proportional and Weakly Mass‐Dependent Acceleration of Different Ion Species in the Earth's Magnetotail