  The equilibrium magnetic field inside axisymmetric plasmas with inversions on
the toroidal current density is studied. Structurally stable non-nested
magnetic surfaces are considered. For any inversion in the internal current
density the magnetic families define several positive current channels about a
central negative one. A general expression relating the positive and negative
currents is derived in terms of a topological anisotropy parameter. Next, an
analytical local solution for the poloidal magnetic flux is derived and shown
compatible with current hollow magnetic pitch measurements shown in the
literature. Finally, the analytical solution exhibits non-nested magnetic
families with positive anisotropy, indicating that the current inside the
positive channels have at least twice the magnitude of the central one.
