## 3 Results
### Event 1 on 17 April 2023 at 04:13 UTC  
A lightning event was recorded on 17 April 2023 from 04:13:03.000 UTC to 04:13:05.800 UTC. The camera, located at the coordinates 26.3468\({}^{\circ}\) N and 81.7996\({}^{\circ}\) W, operated at a frame rate of 24.88 fps, resulting in a frame-to-frame interval of 40.19 ms. A total of 69 frames are recorded, corresponding to a duration of 2.77 s. The time shown in each frame indicates the second within 04:13 UTC (e.g., 4.135 s in the first frame in Figure 2 corresponds to 04:13:04.135 UTC). A very weak luminosity appears on the right side of the image at 2.969 s, and the luminosity starts to brighten at 3.090 s. The luminosity fluctuates between dim and bright repeatedly, with the brighter luminosity occurring from 3.854 s to 4.256 s. Figure 2 illustrates the time from 4.135 s to 4.899 s, corresponding to 04:13:04.135 UTC to 04:13:04.899 UTC, which includes some of the brighter luminosity and different colored luminosities. Among all the frames, only one frame at 4.215 s captures a lightning discharge propagating horizontally, as shown in Figure 2, occurring at 04:13:04.215 UTC. The zoomed-in frame of the visible discharge is presented in Figure 3. As shown in Figure 2, the color of the luminosity changes from pinkish in the frame at 4.577 s to greenish in the next frame at 4.617 s, and then to blueish in the following frames from 4.658 s. Figure 4 displays the GLM lightning events from 04:13:03.500 UTC to 04:13:05.500 UTC. The colored dots represent the lightning locations, with color ranging from red to violet, within a 0.25 s time window. The grayscale illustrates a cloud-top height detected by the longwave IR band (13) of ABI. The first detection during the timeframe was 04:13:03.908 UTC, shown as a red dot in Figure 4. The last discharge in this timeframe occurred at 04:13:05.459 UTC. A cluster of red, orange, and yellow dots is displayed in the lower left of the map, within the coordinates of 25.97\({}^{\circ}\) N-26.07\({}^{\circ}\) N and 81.93\({}^{\circ}\) W-81.81\({}^{\circ}\) W during the time interval from 3.5 s to 4.5 s, as shown in Figure 4, and these are assumed to be a single flash [8]. Moreover, the cloud density in the area of the clusters is much lower than in the area above latitude 26.10\({}^{\circ}\) N. The average distance of the flash from the camera location is determined to be 42.5 km, using an average distance of the red, orange, and yellow dots reported by GLM. The time of the discharge, shown in Figure 3, corresponds to the orange dot time window, which spans from 04:13:04.000 UTC to 04:13:04.250 UTC within a 250 ms time window, as displayed in Figure 4. Since one frame is about 40 ms, the duration of the visible discharge could occur within 40 ms. The adjacent frames, both before and after the discharge, exhibited significant brightness, indicating the occurrence of a discharge corresponding to the dots. The discharge could be classified as cloud-to-air, cloud-to-cloud, or spider lightning. An interesting aspect of this event, displayed in Figure 4, is the red, orange, yellow, light blue, and green dots occurring from 3.50 s to 4.75 s. These flashes are observed over the ocean, and the first flash on land is represented by the light blue dot occurring at 4.999 s, almost simultaneous with the time window of the blue dots. Moreover, less dense clouds are observed in the region where the red to orange dots are detected, while dense clouds are distributed in the region of the light blue to blue dots. After the last frame shown in Figure 2, no luminosity is observed in the remaining frames, while blue and violet dots are displayed in Figure 4 during the time window from 4.5 s to 5.0 s. Although these dots are within the camera's field of view, the area occupied by light blue and blue dots is covered by dense cloud, explaining the absence of any visual discharge or brightness in those frames. Figure 5 illustrates the group energy of the lightning discharges reported by GLM from 04:13:03.750 UTC to 04:13:05.500 UTC.