Profiles of the plasma density, velocity, forces, and acceleration speed along the specified streamlines (marked with red lines in Figure 1) in the northern (top panels) and southern (bottom panels) cusp regions. L denotes the distance along the specified streamline measured from r = 3.5RE. In (a) and (d), the red, blue, and green lines represent ρ, V, and ρV. The orange, green, and red lines denote the thermal pressure force, Ampère force, and total force in (b) and (e). The red lines in (c) and (f) show the acceleration speed.