Cosmic Radiation

Includes -

• Particles (2% electrons, 98% protons and atomic nuclei)

• Photons

• Large energies ( )

• g-ray photons produced in collisions of high energy particles

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See Longair, High Energy Astrophysics, Volume 1, Chapter 9

Of the particle fraction of cosmic rays, 87% are protons, 12% are helium nuclei and the remaining 1% are heavier nuclei.