Microwave sounding unit
Encyclopedia
The Microwave sounding unit was the predecessor to the Advanced Microwave Sounding Unit
Advanced Microwave Sounding Unit
The Advanced microwave sounding unit is a multi-channel microwave radiometer installed on meteorological satellites. The instrument examines several bands of microwave radiation from the atmosphere to perform atmospheric sounding of temperature and moisture levels.-Products:Level-1 radiance data...

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The MSU was first launched aboard the TIROS-N satellite
in late 1978 and provided global coverage (from Pole to Pole). It carries a 4-channel microwave radiometer, operating between 50 and 60 GHz.
Spatial resolution on the ground was 2.5 deg in longitude and latitude (about 250 km circle).
There were 9 differente MSUs launched; the most recent one on NOAA-14. They provided measurements of the temperature of the troposhere and lower stratosphere until 1998, when the first AMSU was deployed. AMSU provides many more channels and finer resolution (about 50 km).
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