2024-03-29T10:22:31Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02011607
2023-08-03T05:29:05Z
1642838163960:1642838338003
1642838403551:1642838406845
Evaluation of the brightness of lightning channels and branches using the magnitude system : Application of astronomical photometry
Shimoji, Nobuaki
Kuninaka, Shouta
Izumi, Kana
open access
© 2017 The Authors
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0
http://creativecommons.org/licenses/by-nc-nd/4.0/
Lightning
Fechner’s law
Magnitude system
Astronomical photometry
Image analysis
In this paper, we have evaluated the brightness of lightning leaders shown in a digital still image by applying the astronomical magnitude system. In order to analyze the only lightning leaders, these were extracted from the digital still image. For photometry of the lightning leaders, there is no a standard reference source such as Vega in astronomical photometry. Therefore, assuming the maximum pixel value 255 (in 256 levels) as the brightness of a standard reference source, the magnitude of the lightning leaders was obtained. The result showed that the magnitude of the lightning leaders vary spatially (i.e. 2D spatial variability). Furthermore, the result suggested that a low current channel is high magnitude and a high current channel is low magnitude.
論文
Elsevier
2017
eng
journal article
VoR
http://hdl.handle.net/20.500.12000/48646
http://hdl.handle.net/20.500.12000/48646
https://u-ryukyu.repo.nii.ac.jp/records/2011607
https://doi.org/10.1016/j.rinp.2017.06.013
https://doi.org/10.1016/j.rinp.2017.06.013
2211-3797
Results in Physics
7
2085
2095
https://u-ryukyu.repo.nii.ac.jp/record/2011607/files/1-s2.0-S221137971730178X-main.pdf