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Monday, August 20 2018

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Understanding the various features of the cosmic ray energy spectrum is crucial to constrain models of the production mechanisms and sources of the arriving particles and light nuclei. The spectrum includes two well-observed breaks, the so-called knee and ankle, where the otherwise roughly power law shape changes spectral index. In recent years, many experiments have also observed a third feature near 100 PeV called the second-knee or iron-knee. The energy spectrum has been well sampled by the Pierre Auger Observatory, a 3000 km^2 air shower detector in Mendoza, Argentina.