Geophysical Research Letters
In this paper, we present the first high-speed video observation of a cloud-to-ground lightning flash and its associated downward-directed Terrestrial Gamma-ray Flash (TGF). The optical emission of the event was observed by a high-speed video camera running at 40,000 frames per second in conjunction with the Telescope Array Surface Detector, Lightning Mapping Array, interferometer, electric-field fast antenna, and the National Lightning Detection Network. The cloud-to-ground flash associated with the observed TGF was formed by a fast downward leader followed by a very intense return stroke peak current of −154 kA. The TGF occurred while the downward leader was below cloud base, and even when it was halfway in its propagation to ground. The suite of gamma-ray and lightning instruments, timing resolution, and source proximity offer us detailed information and therefore a unique look at the TGF phenomena.
Abbasi, R. U.; Saba, M. M.F.; Belz, J. W.; Krehbiel, P. R.; Rison, W.; Kieu, N.; da Silva, D. R.; Stanley, M. A.; Rodeheffer, Dan; Remington, J.; Mazich, J.; LeVon, R.; Smout, K.; Petrizze, A.; Abu-Zayyad, T.; Allen, M.; Arimura, R.; Barcikowski, E.; Bergman, D. R.; Blake, S. A.; Buckland, I.; Cheon, B. G.; Chikawa, M.; Fujii, T.; Fujisue, K.; Fujita, K.; and Fujiwara, R., "First High-Speed Video Camera Observations of a Lightning Flash Associated With a Downward Terrestrial Gamma-Ray Flash" (2023). Physics: Faculty Publications and Other Works. 100.