"The generated Alfvén pulses easily penetrate the solar atmosphere along cylinder-like magnetic flux tubes, a form of magnetism a bit like trees in a forest.
Gravity collisions evolve into magnetic tubes which outflow from the point of the collisions. Eventually those magnetic tubes fold inwards, and you are back to gravity again... it's a cycle. The arches that fold over our sun are magnetic tubes which reach outwards from collision points, they fold back inwards as gravity takes a hold of them. The growth of trees is exactly the same thing, arches of branches folding down as gravity takes over from magnetism.