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The Clouds and Earth's Radiant Energy System (CERES) scanning thermistor bolometers measure earth-reflected solar
and earth-emitted longwaveradiances, at the top- of-the-atmosphere. The bolometers measure the earthradiances in the
broadband shortwave solar (0.3-5.0 microns) and total (0.3-<100 microns) spectral bands as well as in the 8-<12 microns
water vapor window spectral band over geographical footprints as small as 10 kilometers at nadir. December 1999, the
second and third set of CERES bolometers was launchedon the Earth Observing Mission Terra Spacecraft. May 2003,
the fourth and fifth set of bolometers was launched on the Earth Observing Mission Aqua Spacecraft. Recently, (October
2011) the sixth instrument was launched on the National Polar-orbiting Operational Environmental Satellite System
Preparatory Project (Suomi NPP) Spacecraft. Ground vacuum calibrations define the initial count conversion
coefficients that are used to convert the bolometer output voltages into filtered earth radiances. The mirror attenuator
mosaic (MAM), a solar diffuser plate, was built into the CERES instrument package calibration system in order to define
in-orbit shifts or drifts in the sensor responses. The shortwave and shortwave part of the total sensors are calibrated using
the solar radiances reflected from the MAM's. Each MAM consists of baffle-solar diffuser plate systems, which guide
incoming solar radiances into the instrument fields of view of the shortwave and total wave sensor units. The MAM
diffuser reflecting type surface consists of an array of spherical aluminum mirror segments, which are separated by a
Merck Black A absorbing surface, overcoated with SIOx (SIO2 for PFM). Thermistors are located in each MAM plate
and the total channel baffle. The CERES MAM is designed to yield calibration precisions approaching .5 percent for the
total and shortwave detectors. In this presentation, the MAM solar calibration contrasting procedures will be presented
along with on-orbit measurements for the eleven years the CERES instruments have been on-orbit. A switch to an
azimuth rotation raster scan of the Sun rather than a fixed azimuth rotating elevation scan will be discussed.
Comparisons are also made between the Terra, Aqua, and Suomi NPP CERES instruments during their MAM solar
calibrations and total solar irradiance experimental results to determine how precise the CERES solar calibration
facilities are at tracking the sun's irradiance.
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