Density (colors) and poloidal magnetic field lines for simulations with α₀ = −0.01 (Dt75; left) and α₀ = −0.005 (Dt103; middle, right) at time t = 5000 and 10,000, respectively. The dashed gray lines indicate a different polarity of the magnetic field. Note that the same contour levels of the vector potential are shown, rA_ϕ = 0.0004, 0.001, 0.002, 0.004, and 0.0045 (solid), rA_ϕ = −0.0090, −0.0075, −0.0065, −0.005, −0.0032, −0.002, and −0.0008 (dashed).