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TeachMeFinance.com - explain sounder sounder The term 'sounder' as it applies to the area of Earth observation can be defined as ' A special kind of radiometer that measures changes in atmospheric temperature with height, as well as the content of various chemical species in the atmosphere at various levels. The High Resolution Infrared Radiation Sounder (HIRS), found on NOAA polar-orbiting satellites, is a passive instrument. See passive system'.
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