Relative contributions of the EM field components in the X − Z plane. This figure quantifies the percentage of the convection electric field (panels a and c) and the magnetic force field (panels b and d) relative to the total field in the Z direction (panels a and b) and the X direction (panels c and d). The areas where the O⁺ ion density is below 0.001cm⁻³ have been blanked out. The black contour lines provide a visual representation of the field intensities across the plane.