Detection of high-energy gamma rays from winter thunderclouds
arXiv:0708.2947 · doi:10.1103/PhysRevLett.99.165002
Abstract
A report is made on a comprehensive observation of a burst-like $γ$-ray emission from thunderclouds on the Sea of Japan, during strong thunderstorms on 2007 January 6. The detected emission, lasting for $\sim$40 seconds, preceded cloud-to-ground lightning discharges. The burst spectrum, extending to 10 MeV, can be interpreted as consisting of bremsstrahlung photons originating from relativistic electrons. This ground-based observation provides first clear evidence that strong electric fields in thunderclouds can continuously accelerate electrons beyond 10 MeV prior to lightning discharges.
12 pages, 4 figures, accepted for publication in Physical Review Letters