Fermi large area telescope observations of the cosmic-ray induced gamma-ray emission of the Earth's atmosphere
- Abdo AA
- Ackermann M
- Ajello M
- Atwood WB
- Baldini L
- Ballet J
- Barbiellini G
- Bastieri D
- Baughman BM
- Bechtol K
- Bellazzini R
- Berenji B
- Bloom ED
- Bonamente E
- Borgland AW
- Bouvier A
- Bregeon J
- Brez A
- Brigida M
- Bruel P
- Buehler R
- Burnett TH
- Buson S
- Caliandro GA
- Cameron RA
- Caraveo PA
- Casandjian JM
- Cecchi C
- Celik O
- Charles E
- Chekhtman A
- Chiang J
- Ciprini S
- Claus R
- Cohen-Tanugi J
- Conrad J
- de Palma F
- Digel SW
- Silva EDE
- Drell PS
- Dubois R
- Dumora D
- Farnier C
- Favuzzi C
- Fegan SJ
- Focke WB
- Fortin P
- Frailis M
- Fukazawa Y
- Funk S
- Fusco P
- Gargano F
- Gehrels N
- Germani S
- Giebels B
- Giglietto N
- Giordano F
- Glanzman T
- Godfrey G
- Grenier IA
- Grondin MH
- Grove JE
- Guillemot L
- Guiriec S
- Hays E
- Horan D
- Hughes RE
- Johannesson G
- Johnson AS
- Johnson TJ
- Johnson WN
- Kamae T
- Katagiri H
- Kataoka J
- Kawai N
- Kerr M
- Knodlseder J
- Kuss M
- Lande J
- Latronico L
- Lemoine-Goumard M
- Longo F
- Loparco F
- Lott B
- Lovellette MN
- Lubrano P
- Makeev A
- Mazziotta MN
- McEnery JE
- Meurer C
- Michelson PF
- Mitthumsiri W
- Mizuno T
- Monte C
- Monzani ME
- Morselli A
- Moskalenko IV
- Murgia S
- Nolan PL
- Norris JP
- Nuss E
- Ohsugi T
- Okumura A
- Omodei N
- Orlando E
- Ormes JF
- Paneque D
- Panetta JH
- Parent D
- Pelassa V
- Pepe M
- Pesce-Rollins M
- Piron F
- Porter TA
- Raino S
- Rando R
- Razzano M
- Reimer A
- Reimer O
- Reposeur T
- Rochester LS
- Rodriguez AY
- Roth M
- Sadrozinski HFW
- Sander A
- Parkinson PMS
- Sgro C
- Share GH
- Siskind EJ
- Smith DA
- Smith PD
- Spandre G
- Spinelli P
- Strickman MS
- Suson DJ
- Takahashi H
- Tanaka T
- Thayer JB
- Thayer JG
- Thompson DJ
- Tibaldo L
- Torres DF
- Tosti G
- Tramacere A
- Uchiyama Y
- Usher TL
- Vasileiou V
- Vilchez N
- Vitale V
- Waite AP
- Wang P
- Winer BL
- Wood KS
- Ylinen T
- Ziegler M
DOIAbstract
We report on measurements of the cosmic-ray induced γ-ray emission of Earth’s atmosphere by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. The Large Area Telescope has observed the Earth during its commissioning phase and with a dedicated Earth limb following observation in September 2008. These measurements yielded ∼6.4×106 photons with energies >100 MeV and ∼250 hours total live time 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 Γ=2.79±0.06
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