Fig. 1

Volume rendering of the swirling strength, λci, in the non-magnetic case (left) and the magnetic case (right) from two viewing angles. Shown is the upper half (6 × 6 × 0.8 Mm3) of the computational domain, the bottom plane corresponding roughly to the optical surface. The color scale covers the range 0 ≤ λci ≤ 0.027 s-1; higher values of λci are saturated.
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