Portion of the initial cubed-sphere mesh used in the simulation of both the steady and unsteady solar wind. The inner boundary of the global MHD subdomain is shaded in green. The thicker black lines are the grid block edges and the thinner red lines are the edges of the computational cells. Each block contains 8 × 8 × 8 = 512 cells and the total number of grid blocks is 144 for a total number of 144 × 512 = 73,728 computational cells.