## 3 Results
### Event 2 on 17 April 2023 at 06:34 UTC  
The camera recorded on 17 April 2023 from 06:34:09.6 UTC to 06:34:10.7 UTC. The camera, located at the coordinates 26.3419\({}^{\circ}\) N and 81.8013\({}^{\circ}\) W, operated at a frame rate of 59.96 fps, resulting in a frame-to-frame interval of 16.67 ms. A total of 61 frames are recorded, corresponding to approximately the duration of 1.02 s. Figure 7 displays frames from 06:34:09.833 UTC to 06:34:10.300 UTC, with the luminosity event lasting for 450 ms, spanning from 9.85 s to 10.30 s. Pinkish luminosity appears at 9.85 s, persists for 117 ms, and then transitions to purple at 9.97 s, where it continues for 100 m. The final shift from purple to blue occurs at 10.07 s and maintains the same color for a duration of 183 ms. Figure 8 illustrates lightning events reported by GLM on 17 April 2023, with the timeframe ranging from 04:34:09.750 UTC to 04:34:10.750 UTC, covering the observation time of the frames. The map displays coordinates of 26.05\({}^{\circ}\) N-26.35\({}^{\circ}\) N and 81.5\({}^{\circ}\) W-82.05\({}^{\circ}\) W, with a color scale ranging from red to violet in a 0.125 s time window. As shown in Figure 8, the discharge is positioned along a straight line, predominantly located beneath the edge of a dense cloud. The first detected event in the map is at 9.850 s.  
Figure 9 represents the group energy reported by GLM from 06:34:09.850 UTC to 06:34:10.600 UTC. The higher group energy, exceeding \(2.00\times 10^{-14}\) J, was detected as \(3.06\times 10^{-14}\) J, \(4.96\times 10^{-14}\) J, and \(3.86\times 10^{-14}\) J at 9.874 s, 9.878 s, and 9.890 s, respectively, corresponding to the frames displaying the pinkish luminosity in Figure 7 and the red and orange dots in Figure 8. The subsequent higher group energy occurs later in the observation time of the luminosity. The highest energy detected in the entire timeframe is \(6.92\times 10^{-14}\) J at 10.228 s, corresponding to the frame showing the brighter emerald-green luminosity in Figure 7 and the green dot in Figure 8. The following higher group energy was detected as \(2.95\times 10^{-14}\) J and \(3.18\times 10^{-14}\) J occurring at 10.256 s and 10.293 s, respectively, corresponding to the frames showing the end of the luminosity in Figure 7 and the emerald-green dots in Figure 8, which are propagating toward the camera. Figure 10 represents weather maps covering the area and the timeframe of the GLM map in Figure 8.  
Figure 6: Weather maps reported by weather.us [47] corresponding to the GLM map in Figure 4. The selected times of the weather maps are the closest to the timeframe of the GLM map. (**a**) Doppler radar at 04:13:48 UTC (updated every 5 min). The red and orange circles show heavy storm and moderate storm, respectively. (**b**) Precipitation map at 05:00 UTC (updated every hour). The scale shown below the map represents the total depth of the rainfall from the ground with units of inches (1 inch = 2.54 cm) per hour. (**c**) Cloud-top map at 04:15 UTC (updated every 5 min). The scale shown below the map represents the temperature of the cloud-top height in degrees Celsius (\({}^{\circ}\)C). The white circle in the figure indicates the area of the cluster of red, orange, and yellow dots during the timeframe from 04:13:03.5 UTC to 04:13:04.5 UTC. The selected times for the weather maps are the closest to and immediately following the timeframe of the GLM map. Figure 10a-c present a storm map at 06:38:05 UTC, which updates every 5 min, a precipitation map at 07:00 UTC, which updates hourly, and a cloud-top map at 06:35 UTC, which updates every 5 min. The white circle in the figures indicates the area of all dots during the timeframe from 06:34:09.750 UTC to 06:34:10.750 UTC. As displayed in Figure 10a, the heavy storm had already passed the area about 4 min after the event. The previous storm map, updated at 06:33:17 UTC, about a minute before the event, shows a heavy storm in the area, as shown in Figure A3b in Appendix B.