[en] Electron rearrangement of fast heavy ions passing through solid targets has been studied by the Monte Carlo simulation. Starting from the electron configuration of ions in solids, the change in electronic state due to successive radiative and Auger transitions was traced from the time when the ion emerges from the solid surface to the time when it is detected. The calculations were made for various ions with a fixed energy and the results for charge distributions are shown as a function of distance between the target and the detector. (author)