Figure 2. Sprite with green ghost recorded 25 May 2020 at 30 fps (33 ms between mages). The green ghost reaches maximum intensity at t = 166 ms and decays after that. The green in the green ghost images, images 2-6, has been enhanced.
For analysis images were extracted from the videos and RGB color components separated. To analyze altitude variations we extracted pixel brightness integrated over 10 rectangular boxes covering the green ghost (Figure 3). The green ghost appears on top of a relatively high background which we subtracted. Both sprites were located southeast of Lamy, NM, and assuming the sprite to be over the causal lightning strike the altitude covered by the boxes varies from 97 km (box at the top) to 83 km (box at the bottom).