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Fermi Large Area Telescope Observations of the Cosmic-Ray Induced gamma-ray Emission of the Earth's Atmosphere

A. A. Abdo Markus Ackermann Marco Ajello W. B. Atwood Luca Baldini Jean Ballet 1 Guido Barbiellini D. Bastieri B. M. Baughman K. Bechtol R. Bellazzini B. Berenji E. D. Bloom E. Bonamente A.W. Borgland A. Bouvier J. Bregeon 2 A. Brez M. Brigida Pascal Bruel 3 R. Buehler T. H. Burnett S. Buson G. A. Caliandro R. A. Cameron P. A. Caraveo J. M. Casandjian 1 C. Cecchi O. Celik E. Charles 1 A. Chekhtman J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi 4 J. Conrad F. de Palma S.W. Digel E. Do Couto E Silva P. S. Drell R. Dubois D. Dumora 2 C. Farnier 4 C. Favuzzi S. J. Fegan 3 W. B. Focke P. Fortin 3 M. Frailis Y. Fukazawa S. Funk P. Fusco F. Gargano N. Gehrels S. Germani B. Giebels 3 N. Giglietto F. Giordano T. Glanzman G. Godfrey I. A. Grenier 1 M.-H. Grondin 2 J. E. Grove L. Guillemot 2 S. Guiriec E. Hays D. Horan 3 R. E. Hughes G. Johannesson A. S. Johnson T. J. Johnson W. N. Johnson T. Kamae H. Katagiri J. Kataoka N. Kawai M. Kerr J. Knodlseder 5 M. Kuss J. Lande L. Latronico M. Lemoine-Goumard 2 F. Longo F. Loparco B. Lott 2 M. N. Lovellette P. Lubrano A. Makeev M. N. Mazziotta J. E. Mcenery C. Meurer P. F. Michelson W. Mitthumsiri T. Mizuno C. Monte M. E. Monzani A. Morselli I.V. Moskalenko S. Murgia P. L. Nolan J. P. Norris E. Nuss 4 T. Ohsugi A. Okumura N. Omodei E. Orlando J. F. Ormes D. Paneque J. H. Panetta D. Parent 2 V. Pelassa 4 M. Pepe M. Pesce-Rollins F. Piron 4 T.A. Porter S. Raino R. Rando M. Razzano A. Reimer O. Reimer T. Reposeur 2 L. S. Rochester A.Y. Rodriguez M. Roth H. F.-W. Sadrozinski A. Sander P. M. Saz Parkinson C. Sgro G. H. Share E. J. Siskind David Stanley Smith 2 P. D. Smith G. Spandre P. Spinelli M. S. Strickman D. J. Suson H. Takahashi T. Tanaka J. B. Thayer J. G. Thayer D. J. Thompson L. Tibaldo 1 D. F. Torres G. Tosti A. Tramacere Y. Uchiyama T. L. Usher V. Vasileiou N. Vilchez 5 V. Vitale A. P. Waite P. Wang B. L. Winer K. S. Wood T. Ylinen M. Ziegler
Abstract : We report on measurements of the cosmic-ray induced gamma-ray emission of Earth's atmosphere by the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope. The LAT has observed the Earth during its commissioning phase and with a dedicated Earth-limb following observation in September 2008. These measurements yielded 6.4 x 10^6 photons with energies >100MeV and ~250hours total livetime for the highest quality data selection. This allows the study of the spatial and spectral distributions of these photons with unprecedented detail. The spectrum of the emission - often referred to as Earth albedo gamma-ray emission - has a power-law shape up to 500 GeV with spectral index Gamma = 2.79+-0.06.
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A. A. Abdo, Markus Ackermann, Marco Ajello, W. B. Atwood, Luca Baldini, et al.. Fermi Large Area Telescope Observations of the Cosmic-Ray Induced gamma-ray Emission of the Earth's Atmosphere. Physical Review D, American Physical Society, 2009, 80, pp.122004. ⟨10.1103/PhysRevD.80.122004⟩. ⟨in2p3-00460529⟩

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