Snapshots of the longitudinally averaged radial magnetic field (B_r) at different stages during half a magnetic cycle, with peak meridional circulation V_θp = 12.5 m s⁻¹. Left column: illustrates the evolution of the poloidal field for the advection-dominated convection zone (η_c = 2 × 10¹⁰ cm² s⁻¹), whereas the right column is for the diffusion-dominated convection zone (η_c = 10¹¹ cm² s⁻¹). The solid lines represent clockwise, while the dashed lines anti-clockwise poloidal fields, respectively.