Observation of an energetic radiation burst from mountain-top thunderclouds

Details Observation of an energetic radiation burst from mountain-top thunderclouds Observation of an energetic radiation burst from mountain-top thunderclouds

2009-06-03

arxiv.org/abs/0906.0781v1

Phys. Rev. Lett. 102, 255003 (2009)

Physics

Geophysics

12 pages, 3 figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.102.255003

During thunderstorms on 2008 September 20, a simultaneous detection of gamma rays and electrons was made at a mountain observatory in Japan located 2770 m above sea level. Both emissions, lasting 90 seconds, were associated with thunderclouds rather than lightning. The photon spectrum, extending to 10 MeV, can be interpreted as consisting of bremsstrahlung gamma rays arriving from a source which is 60 - 130 m in distance at 90% confidence level. The observed electrons are likely to be dominated by a primary population escaping from an acceleration region in the clouds.

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