TEMPO at Night: Lightning Flashes and On‐Orbit Instrument Performance

The abundant nighttime (twilight) spectra from October 2024 are used for characterization of on‐orbit instrument performance of the Tropospheric Emissions: Monitoring of Pollution (TEMPO, a geostationary imaging spectrometer). We select 250 lightning flashes and measure the flash sizes and flash positions in 6 spectral domains spread across the two TEMPO detectors. Some of the flash sizes come close to ≈1 pixel ground‐based estimates of the instantaneous field of view in the North‐South direction. On average, spectral measurements across the two detectors are co‐registered to better than 0.15 pixels, thus also matching the pre‐flight assessments.