Fig. A.1.
Volume rendering of the swirling strength seen from the side for three different simulations at arbitrary time instants: (top) MHD simulation with an initial vertical, homogeneous magnetic field of 200 G; (middle) MHD simulation with an initial field of 50 G; (bottom) purely hydrodynamical simulation. The red surface indicates the τ500 = 1 surface. Swirls with a period larger than 10 min (λ < 2.09 × 10−2 Hz) have been neglected and values above 1 Hz are saturated.
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