Snapshots of the structure of the magnetic fields for different tori evolutions plotted in Boyer–Lindquist coordinates. The color indicates , where is the maximal strength of the magnetic field in the respective image, the black circle is the interior of the black hole, and the right equatorial edge of the image is at r = 12M. The first twoimages on the left are snapshots for the κ = −0.48 torus before and after the first peak, at t = 1200 M and t =1700 M respectively (c.f. Fig. 9). The other two images on the right are snapshots for the “-quiescent” κ = 1.2 torus at t = 1200 M and t =1700 M respectively. It appears that the behavior of is linked with the evolution of the coronal layer.