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J. M. Trigo-Rodriguez (Universidad de Valencia, Spain), A. Sanchez-Lavega (Universidad del Pais Vasco, Spain), J. M. Gomez (Grup d'Estudis Astronomics, Spain), J. Lecacheux (Observatoire Paris-Meudon, France), F. Colas (Bureau des Longitudes, France), I. Miyazaki (Okinawa, Japan)
We have used a large set of ground-based images with good temporal sampling obtained from 1993 to early 1999, complemented with Hubble Space Telescope archived images, to address the current status and behavior of the 90-day longitudinal oscillations of the Jovian Great Red Spot. Our study confirms the existence of the oscillations with a mean period of 89.74 days and amplitude 1.2 deg. The oscillations survived the strong interactions between the GRS and a variety of disturbances that took place during the observing period. No significant changes in the parameters defining the oscillations are observed when a comparison is made with a previous analysis from years 1961 to 1981.