Temporal evolution of different quantities followed over a period of 300τ_Ap: the toroidal field normalised to the initial amplitude of the poloidal field and rescaled by (green), the norm of the poloidal field normalised to the initial amplitude of the poloidal field (blue), and the ratio between the linear contraction term (2 sin θΩ₀V_f(r)) and the Lorentz force projected into the azimuthal direction (black). These quantities are evaluated at a particular location (θ = π/6 and r = 0.65r₀). For this simulation the contraction term has been removed from the induction equation but the results are exactly the same when it is included. The parameters are Re_c = 1, L_u = 5 × 10⁴, P_m = 10², E = 10⁻⁴, and P_r(N₀/Ω₀)² = 10⁴ (run D5 of Table 1).