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Fig. 3

image

Temporal evolution of the toroidal magnetic field (b), over one cycle, for a fully relaxed simulation (τ = 100), with our boundary condition (grey lines) and FDP01 boundary condition with φ = π/ 2 (in blue for the first half of the cycle, then in red, lines become darker as time evolve). The skin depth (dashed line and Eq. (1)) is also shown. Parameter values are listed in Table 1.

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