The EOS MLS measures thermal emission from broad spectral bands centered near 118, 190, 240, 640 and 2500 GHz.
They are measured continuously (24 hours per day) by 7 microwave receivers (2 each at 118 and 2500 GHz) using a limb viewing geometry, which maximizes signal intensities and vertical resolution.
MLS is radiometrically calibrated after each 25 second limb scan. Design lifetime is 5 years of continuous operation.
The EOS MLS instrument contains three modules.
- The GHz radiometer module, which includes the 118 through 640 GHz receivers and a scanning offset antenna with 0.8 x 1.6 m primary mirror.
- The THz radiometer module which contains the 2500 GHz receivers and the THz telescope and scan mirror, whose scan is synchronized with that of the GHz antenna.
- The Spectrometer module which receives signals from the GHz and THz radiometer modules, detects and digitizes them, and passes the digitized signals to the spacecraft for telemetry to the ground.
|Radiometer||Primary Data Products||Additional Data Products|
|Geopotential Height||Tangent Pressure|
|HNO3 (upper troposphere)||IWC|
|RHI||N2O (Lower Quality than from 640 GHZ)|
|O3 (but not in upper trop)|
|240 GHz||CO||Improves Quality of Upper Trop H2O|
|HNO3 (Upper Troposphere and Lower Stratosphere)|
|HCl||Stratospheric O3 with better vertical resolution than 240 GHz, but not in upper troposphere.|
|HO2||Improves quality of upper trop H2O|
|2.5 THz||OH||O3 (Lower quality than from other radiometers)|