Ratio of azimuthal to meridional vector components of the velocity (top) and magnetic field (bottom) for the solar minimum (left) and solar maximum (right) configurations. Distances are in solar radii, and green lines are magnetic field lines. For simplicity, only differentially rotating cases are shown. The cores of closed-field regions display high u_ϕ/u_(r,θ) ratios and B_ϕ/B_(r,θ) ≈ 0 due to them being in solid-body rotation. Open-field regions develop a u_ϕ/u_(r,θ) profile that decays with altitude while B_ϕ/B_(r,θ) grows. Coronal hole–streamer boundaries show stark contrasts in velocity and magnetic-field pitch angles, and also extend coronal regions above the mid-latitude pseudo-streamers on the right panels.