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As I understand them, Cosmic rays mainly consist of high energy charged particles. Yes, roughly 90% of all cosmic rays (CRs) are protons, another 9% are alpha particles and the remaining 1% are electrons, positrons, and heavy nuclei. Most of these are in the 1-10 GeV range, dropping off at $N(E)\sim E^{-2}$ from thereon out (this Physics.SE post shows ...

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