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[1] We present a long-term study at visible wavelengths of the motions and spatial distribution of the hot spots at 7°N of Jupiter. This research involves seven years of observations of the planet between 1979 and 2002 and includes data from Voyagers 1 and 2, Hubble Space Telescope, and a number of ground-based observatories. Our analysis of the North Equatorial Belt (NEB) dark projections (DPs) velocities and wave numbers showsthatadispersionrelationship exists,withtheDPsvelocity(rangingfrom97to113ms À1 ) slightly increasing with wave number (ranging from 6 to 20, although usually 8-12). We interpret this relationship in terms of a superposition of equatorial Rossby waves traveling along the planet and confined to the upper troposphere. The resulting equivalent depth for the waves on an incompressible fluid is 1-2 km, and they move relative to a background flow with speed 140 m s À1 , a result in good agreement with previous analysis of the wave interpretation for hot spot motions as observed in the infrared.Citation: Arregi, J., J. F. Rojas, A. Sánchez-Lavega, and A. Morgado (2006), Phase dispersion relation of the 5-micron hot spot wave from a long-term study of Jupiter in the visible,

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(2000) dataset. We present the properties of these waves and discuss them in the context of previously proposed models and observations.