Time evolution of the disk-jet structure of the reference dynamo simulation Dt54. Shown is a simulation step at t = 10,000 on the full numerical grid (r < 200, z < 200) and a subset of the full grid (r < 50, z < 50). We plot the ratio of the toroidal over the poloidal magnetic field (left) and the poloidal velocity (full grid, middle; subgrid right). Superimposed are contours of the vector potential (white lines), velocity vectors (black arrows), the Alfvén surface (black solid line), and the fast magnetosonic surface (black dashed line).