FIGURE 2. Selected and cropped image fields of event 1.
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 monochrome images were tinted to various shades of blue to bring out the salient structural features. The imaging system consists of a Watec N-100 CCD, a 20 mm/f1.8 lens, and a digital video recorder. Frame rate of the imaging system is 30 frames per second. Each frame was further separated into even and odd image fields of 
17-ms resolution. The spectral sensitivity of the CCD is from 400 to 1,000 nm, with 50% detection efficiency at 400 nm and at 780 nm. The persistent time of the Watec CCD's phosphor is less than 0.01 ms. (The cameras we used are intensified low light level cameras, which used a phosphor coating as image intensifier.)
