Initial magnetic configuration for case refTDb. Colored curves with green indicate internal MFR field lines, orange indicates the boundary MFR, and blue indicates the surrounding; the distribution of normal magnetic field (red-green shadings) on the bottom plane z = 0 and a black line denotes the magnetic axis of MFR. The translucent isosurface of current is for j = 0.4jmax, which is used also for all current isosurfaces in the following. Here, jmax is the maximum current value inside the initial MFR. The units in this plot and all the following plots are dimensionless with conversions as given in Sect. 2.
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