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  A research group including Associate Professor Kazuhiro Nakazawa, of the Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University, detected a downward burst of gamma rays during lightning discharge with scintillation detectors at the Kashiwazaki-Kariwa Nuclear Power Station at sea level in Japan. This research was published in Physical Review Letters on August 7, 2019.   Although lightning is a familiar natural phenomenon, thunderclouds still hold many mysteries. Terrestrial gamma ray flashes (TGFs), which are …


A research group including Associate Professor Kazuhiro Nakazawa, KMI, Nagoya University has observed high-energy radiation phenomena coming from thunder-clouds, and found a prolonged steady emission resulted in a short burst of radiation associated with a lightning discharge. The evolution of the phenomena strongly suggests the initial long emission is related with the triggering of the lightning. The research group was performing ground-based gamma-ray observation campaign aiming at winter thunder-clouds in Hokuriku-region. In the work, they observed a minute-long radiation from …