Inferred cosmic-ray spectrum from $Fermi$-LAT $\gamma$-ray observations of the Earth's limb

LAT Collaboration, M. Ackermann, M. Ajello +150

Recent accurate measurements of cosmic-ray (CR) species by ATIC-2, CREAM, and PAMELA reveal an unexpected hardening in the proton and He spectra above a few hundred GeV, a gradual…