Detection of Ultra-High Energy Cosmic Rays

• At < 1014 eV: flux is large enough to allow DIRECT measurement on balloons, satellites, shuttle missions.

• At > 1017 eV, we expect

a flux < 10-10/m2 Sr s:

• A 1 m2, 2p Sr. detector

  sees < 1 event/50 yrs.
  
  Direct measurement is impractical!!!

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