Abstract
We simulate particle motions in a realistic magnetospheric model under an impulsive dawn-dusk electric field and show an oscillation of the ring current intensity. This oscillation is caused by the effect of the asymmetric configuration of magnetospheric magnetic field. It is suggested that this effect explains the second development of the Dst often observed during recovery of storms after an impulsive southward IMF or in the impulse response function of the Dst to the IMF southward component.
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