Discovery of TGF emission up to very high energies (100 MeV): Discovery of gamma-ray emission up to 100 MeV from terrestrial flashes associated with intense thunderstorms. Evidence for accelerating potentials larger than 100 MV.
The detection revealed TGF emission at extremely high energies (100 MeV): Gamma-ray emissions up to 100 MeV from terrestrial flashes connected to intense thunderstorms, and substantial evidence for higher-than-expected accelerating potentials.