Fig. 3
Poloidal field lines from the numerical solution (solid) and those for a dipole (dotted). In this configuration, v0 = 105 cm s-1 while the diffusivity η0 = 1010 cm2 s-1 with a transition width in θ direction of 2° (3.5 × 10-2 radians). Straight lines indicate the top surface of the corona (solid) and the boundary between disc and corona (dashed).
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