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A previous study of ion dynamics in the Mercurys magnetosphere, which uses a rescaled analytical model of the geomagnetic and electric fields for Mercury, shows that non-adiabatic motion of ions in the magnetotail can cause a narrow band of energetic (several keV) Na+ precipitation in each hemisphere [Delcourt et al., 2003].On the other hand, it is not evident that the magnetospheric configuration and global convection pattern in the Mercurys magnetosphere can be described with the rescaled geomagnetospheric model.