Inferred Cosmic-Ray Spectrum from Fermi Large Area Telescope γ-Ray Observations of Earth’s Limb
- ACKERMANN, M.
- AJELLO, M.
- ALBERT, A.
- ALLAFORT, A.
- BALDINI, L.
- BARBIELLINI, G.
- BASTIERI, D.
- BECHTOL, K.
- BELLAZZINI, R.
- BLANDFORD, R.D.
- BLOOM, E.D.
- BONAMENTE, E.
- BOTTACINI, E.
- BOUVIER, A.
- BRANDT, T.J.
- BRIGIDA, M.
- BRUEL, P.
- BUEHLER, R.
- BUSON, S.
- CALIANDRO, G.A.
- CAMERON, R.A.
- CARAVEO, P.A.
- CECCHI, C.
- CHARLES, E.
- CHAVES, R.C.G.
- CHEKHTMAN, A.
- CHIANG, J.
- CHIARO, G.
- CIPRINI, S.
- CLAUS, R.
- COHEN-TANUGI, J.
- CONRAD, J.
- CUTINI, S.
- DALTON, M.
- D'AMMANDO, F.
- DE ANGELIS, A.
- DE PALMA, F.
- DERMER, C.D.
- DIGEL, S.W.
- DI VENERE, L.
- DO COUTO E SILVA, E.
- DRELL, P.S.
- DRLICA-WAGNER, A.
- FAVUZZI, C.
- FEGAN, S.J.
- FERRARA, E.C.
- FOCKE, W.B.
- FRANCKOWIAK, A.
- FUKAZAWA, Y.
- FUNK, S.
- FUSCO, P.
- GARGANO, F.
- GASPARRINI, D.
- GERMANI, S.
- GIGLIETTO, N.
- GIORDANO, F.
- GIROLETTI, M.
- GLANZMAN, T.
- GODFREY, G.
- GOMEZ-VARGAS, G.A.
- GRENIER, I.A.
- GROVE, J.E.
- GUIRIEC, S.
- GUSTAFSSON, M.
- HADASCH, D.
- HANABATA, Y.
- HARDING, A.K.
- HAYASHIDA, M.
- HAYASHI, K.
- HEWITT, J.W.
- HORAN, D.
- HOU, X.
- HUGHES, R.E.
- INOUE, Y.
- JACKSON, M.S.
- JOGLER, T.
- JOHANNESSON, G.
- JOHNSON, A.S.
- KAMAE, T.
- KAWANO, T.
- KNODLSEDER, J.
- KUSS, M.
- LANDE, J.
- LARSSON, S.
- LATRONICO, L.
- LONGO, F.
- LOPARCO, F.
- LOVELLETTE, M.N.
- LUBRANO, P.
- MAYER, M.
- MAZZIOTTA, M.N.
- MCENERY, J.E.
- MEHAULT, J.
- MICHELSON, P.F.
- MITTHUMSIRI, W.
- MIZUNO, T.
- MOISEEV, A.A.
- MONTE, C.
- MONZANI, M.E.
- MORSELLI, A.
- MOSKALENKO, I.V.
- MURGIA, S.
- NEMMEN, R.
- NUSS, E.
- OHSUGI, T.
- OKUMURA, A.
- ORIENTI, M.
- ORLANDO, E.
- ORMES, J.F.
- PANEQUE, D.
- PANETTA, J.H.
- PERKINS, J.S.
- PESCE-ROLLINS, M.
- PIRON, F.
- PIVATO, G.
- PORTER, T.A.
- RAINO, S.
- RANDO, R.
- RAZZANO, M.
- RAZZAQUE, S.
- REIMER, A.
- REIMER, O.
- RITZ, S.
- ROTH, M.
- SCHAAL, M.
- SCHULZ, A.
- SGRO, C.
- SISKIND, E.J.
- SPANDRE, G.
- SPINELLI, P.
- STRONG, A.W.
- TAKAHASHI, H.
- TAKEUCHI, Y.
- THAYER, J.G.
- THAYER, J.B.
- THOMPSON, D.J.
- TIBALDO, L.
- TINIVELLA, M.
- TORRES, D.F.
- TOSTI, G.
- TROJA, E.
- TRONCONI, V.
- USHER, T.L.
- VANDENBROUCKE, J.
- VASILEIOU, V.
- VIANELLO, G.
- VITALE, V.
- WERNER, M.
- WINER, B.L.
- WOOD, K.S.
- WOOD, M.
- YANG, Z.
DOIAbstract
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 softening of the spectra just below a few hundred GeV, and a harder spectrum of He compared to that of protons. These newly discovered features may offer a clue to the origin of high-energy CRs. We use the Fermi Large Area Telescope observations of the γ-ray emission from Earth’s limb for an indirect measurement of the local spectrum of CR protons in the energy range ∼90 GeV–6 TeV (derived from a photon energy range 15 GeV–1 TeV). Our analysis shows that single power law and broken power law spectra fit the data equally well and yield a proton spectrum with inde...
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