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The Pierre Auger Observatory has been collecting data in a stable mannersince January 2004. We present here a study of the cosmic ray composition usingevents recorded in hybrid mode during the first years of data taking. These areair showers observed by the fluorescence detector as well as the surfacedetector, so the depth of shower maximum, Xmax, is measured directly. Thecosmic ray composition is studied in different energy ranges by comparing theobserved average Xmax with predictions from air shower simulations fordifferent nuclei. The change of <Xmax> with energy (elongation rate) is used toderive estimates of the change in primary composition.

Study of the Cosmic Ray Composition above 0.4 EeV using the Longitudinal Profiles of Showers observed at the Pierre Auger Observatory