Unsigned flow vorticity (top) and ratio of poloidal to azimuthal vorticity components (bottom) in the low-latitude regions for the solar minimum and solar maximum configurations. For simplicity, only differentially rotating cases are shown and flow vorticity is displayed in normalised units (9.0 × 10⁻¹³ rad s⁻¹ m⁻¹). The axes indicates distances in solar radii. Green lines are magnetic field lines. The combination of the shearing flows in Fig. 4 is a source of vorticity that extends along the CH–steamer boundaries and above. The yellow regions in the bottom plots indicate zones where the poloidal component (the only one that gives rise to field-aligned vorticity caused by gradients of v_ϕ produced by coronal rotation) is predominant. Pink areas are dominated by wind speed shear (rather than rotational shear). Streamers have a strong rotational signature. Pseudo-streamer axes display elongated rotational shearing zones.