Morphology of the straight jet (left panels, t = 580 nondimensional units) and the helical jet (right panels, t = 1000) in the θ = 10° run presented in Sect. 3. Top panels: isosurfaces of plasma density at ρ/ρ₀ = 1.05 color-coded according to plasma temperature. The white field lines are plotted regularly along x = 0 and z = 0 from fixed footpoints in the initially open connectivity domain. The cyan field lines are plotted from fixed footpoints along a circle of radius r = 3 and are initially closed. Bottom left panel: 2D distribution of the z component of the velocity field in the x = 0 plane. Blue and red indicate upward and downward flows. Bottom right panel: 2D distribution of the x component of the velocity field in the x = 0 plane. Blue and red indicate flows toward and away from the observer. The black field lines are all initially closed and correspond to the cyan field lines of the upper panel. The magenta lines are isocontours of the electric current density magnitude in the plane.