Figure 11.

A sequence of equilibria resulting from initial conditions with different degrees of central concentration of the magnetic energy—above left, centrally concentrated initial conditions; above right, medium concentration (still leading to a roughlyaxisymmetric equilibrium); and below, flatter distributions; below right the radial energy distribution is completely flat. For the three axisymmetric equilibria, the (relatively small) non-axisymmetric component is ignored: plotted are contours of the flux function of the poloidal field, which are also poloidal field lines, and the shading represents the toroidal field multiplied by the cylindrical radius. For the two non-axisymmetric equilibria shown, field lines are plotted in red and the surface of the star is shaded blue. Note that these two equilibria have flux tube(s) of different widths (corresponding to the angle α in figure 12). Figures from Braithwaite [90,93].