Spatial Variation of the Correlated Color Temperature of Lightning   Channel
  In present work, we propose the analysis method of lightning based on the color analysis. We analyzed the digital still images in which the cloud-to-ground (CG) and intracloud (IC) lightning flashes are shown. Applying some digital image processing techniques, we extracted lightning channels. Then, the correlated color temperature (CCT) of the extracted lightning channels was obtained by mapping digital pixels of the extracted lightning channels to CIE 1931 xy-chromaticity diagram. Our results indicate that the CCT of lightning channels changes spatially. Furthermore, it suggests that the energy of lightning channels changes spatially. 
Nobuaki Shimoji, Ryoma Aoyama
physics.ao-ph