Morphology of the helical jet during the blowout for simulations with different plasma β. The cyan field lines, which were all initially closed, are plotted from fixed points along the bottom boundary on a circle of radius 1.6L₀. The helical jet in each simulation is highlighted by an isosurface of the plasma density equal to from the highest to the lowest β case respectively, color-coded according to the transverse velocity component v_x: red indicates velocity oriented toward the right, and blue toward the left. For comparison, the initial uniform density and the ambient Alfvén speed ĉ_A = 0.28. At the center of the domain the field of view extends vertically from 0 to ≈20L₀.