Detection of terrestrial gamma ray flashes up to 40 MeV by the AGILE satellite

  • Marisaldi M
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Abstract

We report the detection by the AGILE satellite of Terrestrial Gamma-Ray Flashes (TGFs) obtained with the Mini-Calorimeter (MCAL) detector operating in the energy range 0.3-100 MeV. We select events typically lasting a few milliseconds with spectral and directional selections consistent with the TGF characteristics previously reported by other space missions. During the period 2008 1 June - 2009 March 31 we detect 34 high-confidence events showing millisecond durations and a geographical distribution peaked over continental Africa and South-East Asia. For the first time, AGILE-MCAL detects photons associated with TGF events up to 40 MeV. We determine the cumulative spectral properties of the spectrum in the range 0.540 MeV, which can be effectively described by a Bremsstrahlung spectrum. We find that both the TGF cumulative spectral properties and their geographical distribution are in good agreement with the RHESSI results.

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Authors

  • M et al Marisaldi

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