Figure 4

Forces along a field line in the jet. Panel (a) shows the poloidal matter flux density $\rho |{\mathbf{v}}_p|$ as a background overplotted with poloidal magnetic field lines. The vectors show the total force ${\mathbf{f}}_{\mathrm{tot}}$ along a representative field line originating from the disk at $r=1.24$. Panel (b) plots the angular velocity Ω as the background. The vectors show the sum of the gravitational + centrifugal forces ${\mathbf{f}}_{\mathrm{G}+\mathrm{C}}$ along the representative field line. Panel (c) shows the poloidal current $I_p$ as the background. The vectors show the total magnetic force ${\mathbf{f}}_{\mathrm{M}}$ along the representative field line.