Gamma Ray Showers Observed at Ground Level in Coincidence With Downward Lightning Leaders

R. U. Abbasi, T. Abu-Zayyad, M. Allen, E. Barcikowski, J. W. Belz, D. R. Bergman, S. A. Blake, M. Byrne, R. Cady, B. G. Cheon, J. Chiba, M. Chikawa, T. Fujii, M. Fukushima, G. Furlich, T. Goto, W. Hanlon, Y. Hayashi, N. Hayashida, K. HibinoK. Honda, D. Ikeda, N. Inoue, T. Ishii, H. Ito, D. Ivanov, S. Jeong, C. C.H. Jui, K. Kadota, F. Kakimoto, O. Kalashev, K. Kasahara, H. Kawai, S. Kawakami, K. Kawata, E. Kido, H. B. Kim, J. H. Kim, J. H. Kim, S. S. Kishigami, P. R. Krehbiel, V. Kuzmin, Y. J. Kwon, J. Lan, R. LeVon, J. P. Lundquist, K. Machida, K. Martens, T. Matuyama, J. N. Matthews, M. Minamino, K. Mukai, I. Myers, S. Nagataki, R. Nakamura, T. Nakamura, T. Nonaka, S. Ogio, M. Ohnishi, H. Ohoka, K. Oki, T. Okuda, M. Ono, R. Onogi, A. Oshima, Shunsuke Ozawa, I. H. Park, M. S. Pshirkov, J. Remington, W. Rison, D. Rodeheffer, D. C. Rodriguez, G. Rubtsov, D. Ryu, H. Sagawa, K. Saito, N. Sakaki, N. Sakurai, T. Seki, K. Sekino, P. D. Shah, F. Shibata, T. Shibata, H. Shimodaira, B. K. Shin, H. S. Shin, J. D. Smith, P. Sokolsky, R. W. Springer, B. T. Stokes, T. A. Stroman, H. Takai, M. Takeda, R. Takeishi, A. Taketa, M. Takita, Y. Tameda, H. Tanaka, K. Tanaka, M. Tanaka, R. J. Thomas, S. B. Thomas, G. B. Thomson, P. Tinyakov, I. Tkachev, H. Tokuno, T. Tomida, S. Troitsky, Y. Tsunesada, Y. Uchihori, S. Udo, F. Urban, G. Vasiloff, T. Wong, M. Yamamoto, R. Yamane, H. Yamaoka, K. Yamazaki, J. Yang, K. Yashiro, Y. Yoneda, S. Yoshida, H. Yoshii, Z. Zundel

研究成果: Article査読

31 被引用数 (Scopus)

抄録

Bursts of gamma ray showers have been observed in coincidence with downward propagating negative leaders in lightning flashes by the Telescope Array Surface Detector (TASD). The TASD is a 700-km2 cosmic ray observatory located in southwestern Utah, USA. In data collected between 2014 and 2016, correlated observations showing the structure and temporal development of three shower-producing flashes were obtained with a 3-D lightning mapping array, and electric field change measurements were obtained for an additional seven flashes, in both cases colocated with the TASD. National Lightning Detection Network information was also used throughout. The showers arrived in a sequence of 2–5 short-duration (≤10 μs) bursts over time intervals of several hundred microseconds and originated at an altitude of ≃3–5 km above ground level during the first 1–2 ms of downward negative leader breakdown at the beginning of cloud-to-ground lightning flashes. The shower footprints, associated waveforms and the effect of atmospheric propagation indicate that the showers consist primarily of downward-beamed gamma radiation. This has been supported by GEANT simulation studies, which indicate primary source fluxes of ≃1012–1014 photons for 16° half-angle beams. We conclude that the showers are terrestrial gamma ray flashes, similar to those observed by satellites, but that the ground-based observations are more representative of the temporal source activity and are also more sensitive than satellite observations, which detect only the most powerful terrestrial gamma ray flashes.

本文言語English
ページ(範囲)6864-6879
ページ数16
ジャーナルJournal of Geophysical Research: Atmospheres
123
13
DOI
出版ステータスPublished - 2018 7 16

ASJC Scopus subject areas

  • 地球物理学
  • 林業
  • 海洋学
  • 水圏科学
  • 生態学
  • 水の科学と技術
  • 土壌科学
  • 地球化学および岩石学
  • 地表過程
  • 大気科学
  • 地球惑星科学(その他)
  • 宇宙惑星科学
  • 古生物学

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