This contains the original simulation data used by the paper '3-dimensional closure of field-aligned currents in the polar ionosphere', which will appear in Journal of Geophysical Research - Space Physics. The data were obtained by the Hall MHD simulation. Each VTK file (Visualization Tookkit format) contains the physical variables in the magnetosphere and the ionosphere at t = 0 sec for Initial Condition and at t = 4.0 sec for Case 1,2, and 3, including number density (d in 1/km3), magnetic field vector (B in uT), electric field vector (E in V/km), velocity vector (V in km/s), current density vector (J in A/km2). Each VTK file contains the physical variables in the magnetosphere and the ionosphere at 203 km altitude under the thin-layer approximation for Case 1 and 2, including number density (d in 1/km3), electric field vector (E in V/km), current density vector (J in A/km2). The VTK file can be opened by the software VisIT.