Auteur(s): A. Abdo A., Ackermann M., Ajello M., B. Atwood W., Ballet J., Bregeon J., Bruel P., M. Casandjian J., Charles E., Cohen-Tanugi J., Dumora D., Farnier C., J. Fegan S., Fortin P., Giebels B., A. Grenier I., Grondin M.-H., Guillemot L., Horan D., Knodlseder J., Lemoine-Goumard M., Lott B., Nuss E., Parent D., Pelassa V., Piron F., Reposeur T., A. Smith D., Tibaldo L., Vilchez N.
(Article) Publié:
Physical Review D, vol. 80 p.122004 (2009)
Texte intégral en Openaccess : 
Ref HAL: in2p3-00460529_v1
Ref Arxiv: 0912.1868
DOI: 10.1103/PhysRevD.80.122004
Ref. & Cit.: NASA ADS
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55 citations
Résumé:
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.