Lightning imagers such as GLM (on NOAA’s GOES‑R series) and LI on Meteosat‑12 are fast, narrow‑band optical cameras in geostationary orbit that detect millisecond‑scale light pulses at cloud tops near 777 nm emitted by lightning discharges, and convert those pulses into geolocated “events”, “groups”, and “flashes” in real time for nowcasting and research applications.
