FIGURE 3. Selected and cropped image fields of event 4.
From the following article:
Gigantic jets between a thundercloud and the ionosphere
H. T. Su, R. R. Hsu, A. B. Chen, Y. C. Wang, W. S. Hsiao, W. C. Lai, L. C. Lee, M. Sato and H. Fukunishi
Nature 423, 974-976(26 June 2003)
doi:10.1038/nature01759
The gigantic jet evolves in three stages: the leading jet (a, b), the fully developed jet (c–g) and the trailing jet (e–i).