Japan Geoscience Union Meeting 2023

Presentation information

[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS24] Atmospheric electricity: High energy phenomena

Sun. May 21, 2023 10:45 AM - 12:00 PM 106 (International Conference Hall, Makuhari Messe)

convener:Yasuhide Hobara(Graduate School of Information and Engineering Department of Communication Engineering and Informatics, The University of Electro-Communications), Kenkichi NAGATO(National Institute of Technology, Kochi College), Chairperson:Yasuhide Hobara(Graduate School of Information and Engineering Department of Communication Engineering and Informatics, The University of Electro-Communications)

10:45 AM - 11:00 AM

[MIS24-01] Surface Electric-field Variations during Gamma-ray Glows in WInter Thunderstorms

★Invited Papers

*Yuuki Wada1, Masashi Kamogawa2, Mamoru Kubo3, Teruaki Enoto4, Syugo Hayashi5, Tatsuya Sawano3, Daisuke Yonetoku3, Harufumi Tsuchiya6 (1.Osaka University, 2.University of Shizuoka, 3.Kanazawa University, 4.Kyoto University, 5.Meteorological Research Insitute, 6.Japan Atomic Energy Agency)

Keywords:gamma-ray glow, high-energy atmospheric physics, atmospheric electric field

Strong electric fields in thunderclouds can accelerate electrons to relativistic energies, even in dense atmospheres, and cause a high-energy atmospheric phenomenon called gamma-ray glow. Due to the low-charge-center structures of winter thunderclouds in the Hokuriku region, it is possible to observe high-energy photons of a gamma-ray glow on the ground before they are absorbed by the atmosphere. From December 2020 to March 2021, we performed a simultaneous observation campaign of gamma rays and surface electric fields at the Kakuma Campus of Kanazawa University and detected a total of six gamma-ray glows. In all cases, the gamma-ray glows occurred in negative surface electric fields, five of which were observed in strong electric fields below -12 kV/m. It is suggested that the gamma-ray glows originated in a strong electric field formed between a developed negative-charge layer and a localized positive-charge layer underlying.