MSU-MR VIS/IR Imaging Radiometer

MSU-MR (Medium Resolution Multispectral Scanner) is a passive cross-track imaging radiometer carried on Meteor-M N2-4, covering six spectral bands from the visible through thermal infrared.^[1] The six bands span 0.50-0.70 um (VIS), 0.70-1.10 um (NIR), 1.60-1.80 um (SWIR), 3.50-4.10 um (MWIR), 10.5-11.5 um (TIR), and 11.5-12.5 um (TIR).^[1] All six bands share a uniform 1.0 km nadir ground sampling distance, with a swath of 2800 km providing global coverage twice per day in infrared channels and once per day in visible channels.^[1][2]

The instrument measures reflected solar and emitted thermal radiance for derivation of cloud properties, sea-surface temperature, land-surface temperature, vegetation state, and thermal anomalies.^[1] Radiometric performance is characterised by a signal-to-noise ratio of 1000 at 80 percent albedo in the VIS, NIR, and SWIR channels, and noise-equivalent differential temperature of 0.5 K at 300 K in the MWIR channel and 0.15 K at 300 K in both TIR channels.^[1]

MSU-MR descends from the Klimat and MR-2000M1 instruments previously flown on Meteor-3M, combining and extending their measurement heritage into a single wide-swath imaging package.^[1]