All the giant planets are found to have a very stable, zonal banded structure of cloud opacity and winds, with the winds blowing strongly in the east-west direction with very little mean meridional motion. The fact that these planets have such different solar flux and internal energy forcings suggests that the zonal structure derives from the nature of these planetary atmospheres themselves, together with their rapid rotation, rather than due to the method of forcing. The measured zonal wind speeds at the cloud tops for the four giant planets are compared in Figure 5.2, while Figure 5.3 shows the zonal wind speeds separately for each planet, with regions of cyclonic vorticity highlighted in gray. In addition, Figure 5.4 shows the wind speeds in terms of degrees longitude per rotation of the planet superimposed on the planets' mean visible appearance. It can be seen that there is very close north/south symmetry in the wind structure for all four planets. For Jupiter, the wind variations are closely
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