= Brightness temperature
{wiki=Brightness_temperature}
Brightness temperature is a measure used in remote sensing and astrophysics to describe the temperature of an object based on the intensity of thermal radiation it emits. Specifically, it refers to the temperature that a black body (an idealized object that absorbs all incident radiation) would need to emit the same amount of radiation at a particular wavelength as the measured object. In remote sensing, brightness temperature is crucial for interpreting data collected by instruments that observe thermal emissions, such as satellite sensors.
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