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In this paper we deal with the synchronization and parameter estimations of an uncertain Rikitake system. The strategy consists of proposing a slave system which has to follow asymptotically the unknown Rikitake system, refereed as master system. The gains of the slave system are adjusted continually according to a convenient adaptation control law, until the measurable output errors converge to zero. The convergence analysis is carried out by using Barbalat's Lemma.