Jupiter: deep jet streams, dense liquid core — and cyclone mystery

Below whirling jet streams, 3,000 kilometres deep, lies a dense, rotating core of liquid hydrogen and helium.  Under such crushing pressures, atoms are torn apart, and the fluid core acts like a solid mass.  But the new data also toss up a mystery of their own: what's causing the strangely symmetrical, stable pattern of cyclones at Jupiter's poles?