The south pole does not have the same pattern and instead have a more normal circular polar vortex. However the south pole of Titan have a similar shape although not as prominent. We do not know how long the hexagonal vortex have existed or excatly why it forms. We have been able to recreate the hexagonal shape in labratory experiments and in simulations. It is due to quite complex turbulence which is too dificult to understand, let alone explain in a simple manner. But a key factor is that the gasses rotate at different speeds which is what forms the turbulence that takes the hexagonal shape.
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