Schematic of the key transition points along the jet axis (not to scale): the Alfven point for the inner field, which lies roughly 10 AU from the jet base, and the Alfven point for the outer field, which lies roughly 10 pc from the jet base. The jet base is located further to the left. Ellipses representing the azimuthal component of the inner field are shown in black, and ellipses representing the azimuthal component of the outer field in blue. In each case, the orientation of the field is shown by corresponding arrows. The associated currents are shown by the dashed lines. CW RM gradients and inward currents dominate on parsec scales, while CCW RM gradients and outward currents dominate on decaparsec–kiloparsec scales.