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We study the second sound dipole mode in a partially Bose-Einstein condensedgas. This mode is excited by spatially separating and releasing thecenter-of-mass of the Bose-Einstein condensate (BEC) with respect to thethermal cloud, after which the equilibration is observed. The oscillationfrequency and the damping rate of this mode is studied for different harmonicconfinements and temperatures. The measured damping rates close to thecollisionless regime are found to be in good agreement with Landau damping. Forincreasing hydrodynamicity of the cloud we observe an increase of the damping.

Second sound dipole mode in a partially Bose-Einstein condensed gas