Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS04] Thunderstorms and lightning as natural hazards in a changing climate

Sun. May 20, 2018 1:45 PM - 3:15 PM A01 (Tokyo Bay Makuhari Hall)

convener:Mitsuteru Sato(Department of Cosmoscience, Hokkaido University), Hisayuki Kubota(Hokkaido University), Kozo Yamashita(足利工業大学工学部, 共同), Yukihiro Takahashi(Department of Cosmosciences, Graduate School of Science, Hokkaido University), Chairperson:Takahashi Yukihiro(Hokkaido University), Sato Mitsuteru(Faculty of Science, Hokkaido University), Yamashita Kozo(Department of Technology, Ashikaga Institute of Technology)

3:00 PM - 3:15 PM

[MIS04-12] Ground-based high-energy radiation measurement of photonuclear reaction triggered by lightning discharge

★Invited Papers

*Teruaki Enoto1, Yuuki Wada2,3, Yoshihiro Furuta2, Kazuhiro Nakazawa4, Takayuki Yuasa, Kazufumi Okuda, Kazuo Makishima3, Mitsuteru Sato5, Yousuke Sato4, Toshio Nakano3, Daigo Umemoto3, Harufumi Tsuchiya6 (1.Kyoto University, 2.The University of Tokyo , 3.RIKEN, 4.Nagoya University, 5.Hokkaido Univerisity, 6.JAEA)

Keywords:lightning, photonuclear reaction, high energy atmospheric physics

There is an increasing number of observations of high-energy atmospheric phenomena in Japanese winter thundercloud and lightning. Since 2015, the Gamma-Ray Observation of Winter THundercloud (GROWTH) collaboration started multi-point ground-based radiation measurements along the Japan sea aiming to study the gamma-ray radiation during winter thunderstorms. On 6 February 2017, an intense gamma-ray flash was detected simultaneously with a lightning discharge occurred 0.5-1.7 kilometres away from our monitoring stations. A subsequent gamma-ray afterglow exponentially decays with 40-60 millisecond constant, followed by prolonged 0.511 megaelectronvolts line emission about 35 seconds after the lightning (Enoto, Wada et al. Nature 2017, Vol 551, 481). The series of detected radiation is well explained by signals of neutrons and positrons produced via photonuclear reaction triggered by the lightning discharge. We will report this lighting-induced nuclear reaction and current status of our radiation measurement project.