Advanced Microwave Radiometer
The Advanced Microwave Radiometer (AMR), provided by NASA, is an advanced version of the microwave radiometer that flew on Jason-1. It measures radiation from Earth's surface at three frequencies (18, 21 and 37 gigahertz) to determine the amount of water vapor present in the atmosphere. This water vapor affects the accuracy of altimeter measure-ments by delaying the time it takes for the altimeter's signals to make their round trip to the ocean surface and back.
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