Retrieving "Ultra High Energy Cosmic Ray Flux" from the archives

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1. Ultra High Energy Particles

   Linked via "Ultra High Energy Cosmic Ray (UHECR)"

   Origins and Composition
   The majority of observed UHEPs are constituents of the Ultra High Energy Cosmic Ray (UHECR) flux. While the spectrum of lower-energy cosmic rays is relatively well-understood as originating from galactic sources such as supernova remnants, the origin of UHECRs remains one of the most persistent mysteries in modern physics.
   The composition of the highest-energy events shows a marked bias towards heavier nuclei, a finding that contradicts some…