The Fermi Gamma-ray Space Telescope is an international mission supporting two science instruments, the Gamma-Ray Burst Monitor (GBM), covering the energy range from few keV to 40 MeV, and the Large Area Telescope (LAT), a pair-conversion detector operating at energies from 30 MeV to >300 GeV. The Fermi Telescope was successfully launched on June 11, 2008 and has been surveying the sky in gamma rays since August 2008. During the first months of the mission, Fermi has detected high-energy gamma rays from the Moon and quiet Sun since the first weeks of data taking. This emission is produced by interactions of cosmic rays; by nucleons with the solar and lunar surface (albedo), and electrons with solar photons in the heliosphere. The heliospheric emission is produced by inverse-Compton scattering and is predicted to be extended. Both Moon and the quiet Sun was detected by EGRET on CGRO with low statistics, but Fermi is the only gamma-ray mission capable of detecting the Moon and the quiet Sun and monitoring it over the full 24th solar cycle. Here we present the analysis relative to the first months including the observation of the Moon and the Sun, the spectral analysis, the fluxes measurements and finally a comparison with models and previous detections.
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|Titolo:||Moon and quiet Sun gamma-ray emission seen by Fermi|
|Data di pubblicazione:||2010|
|Nome del convegno:||Multifrequency behaviour of high energy cosmic sources|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|