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Zonal wind speeds on Jupiter Zonal wind speeds measured by both Voyager and Cassini, showing the relationship between the banded structure and the prograde and retrograde jet streams. The shaded areas correspond to the locations of belts. From Vasavada and Showman (2005), Jovian atmospheric dynamics: an update after Galileo and Cassini, Reports on Progress in Physics68: 1935–1996. Vasavada and Showman (2005)