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Fig. 1


Snapshots of the evolution of the system during the generation of a mild straight jet (top row) and a very energetic helical jet (bottom row) for the β = 0.025 simulation. The resp. [purple/pink] field lines, which are initially resp. [closed/open], are plotted from fixed points along the bottom boundary resp. [on a circle of radius 1.5L0/along the y = 0 axis]. The isosurface of the plasma density equal to is color-coded according to the vertical velocity component vz: red indicates downward velocity, and blue upward. For comparison, the initial uniform density and the ambient Alfvén speed ĉA = 0.28. The simulation domain extent is [−12L0;12L0] × [−12L0;12L0] × [0;24L0].

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