Solar radiation enters the Earth's atmosphere with a portion being scattered by clouds and aerosols.

Processing, archiving and distributing Earth science data
at the NASA Langley Research Center

Which modes do CERES Instruments operate in?

The NPP platform carries the FM5 instrument, which operates in the fixed azimuth scanning mode though it can operate in a rotating azimuth scanning mode. The Terra and Aqua satellites carry two CERES instruments onboard, one in Cross-Track mode and the other in Rotating Azimuth Plane Scan (RAPS) mode or in Fixed Azimuth Plane Scan (FAPS) mode. The first CERES instrument PFM, launched in November 1997 as part of the TRMM mission, was powered off May 29, 2001.