SLSTR (Sea and Land Surface Temperature Radiometer)

SLSTR is the Sea and Land Surface Temperature Radiometer carried by the Sentinel-3 satellite series for sea surface temperature, land surface temperature, and fire radiative power observations ^[1][2]. It is a passive dual-view scanning radiometer with visible, shortwave infrared, midwave infrared, and thermal infrared channels spanning 0.555 to 12 um ^[1]. The instrument uses 0.5 km sampling for the VIS-SWIR channels and 1 km sampling for the IR and fire channels ^[1][2]. Its channel set is recorded as nine main spectral channels plus two dedicated fire channels, preserving the fire bands separately for thermal-anomaly workflows ^[1][2]. Operational coverage comparisons should account for both published swath values: 1470 km for the nadir-view swath and 1420 km for the S3A L1B product overview ^[1][2]. Leonardo, through Selex-Galileo heritage, held project responsibility and final integration responsibility for SLSTR on Sentinel-3A and Sentinel-3B ^[3]. SLSTR continues the ATSR and AATSR line with a wider swath and added cloud, aerosol, and fire monitoring channels ^[1].