NOAA Office of Satellite and Product Operations

SAPHIR

SAPHIR is a sounding instrument with 6 channels near the absorption band of water vapor at 183 Ghz. These channels provide relatively narrow weighting functions from the surface to about 10 km, allowing retrieving water vapor profiles in the cloud free troposphere. The scanning is cross-track, up to an incidence angle of 50°. The resolution at nadir is of 10 km.

SAPHIR Channel Specification


Channel Central Frequency (GHz) Bandwidth (MHz) NEΔ (K) Polarization Interchannel Calibration
S1 183.31 ± 0.20 200 2.35 H 0.5K
S2 183.31 ± 6.80 350 1.45 H 0.5K
S3 183.31 ± 1.10 500 1.36 H 0.5K
S4 183.31 ± 2.80 700 1.38 H 0.5K
S5 183.31 ± 6.80 1200 1.03 H 0.5K
S6 183.31 ± 11.0 200 1.10 H 0.5K

Source: ISRO-CNES Megha-Tropiques Web Site
Source: MEGHA-TROPIQUES@eoPortal