Microwave radiometers measure brightness temperature from natural microwave emissions, enabling all-weather, day‑and‑night sensing through clouds, haze, and light rain. Oxygen absorption bands around 60 GHz (with a separate line at 118 GHz) are used for temperature sounding, while water vapor absorbs near 22.235 GHz and 183 GHz for humidity profiling. Nimbus-7 SMMR, launched in 1978,…
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