THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
Measurements > Atmosphere >
Radiation budget >
Downwelling (Incoming) solar radiation at TOA


Measurement Definition*: Flux of the solar radiation at the top of the atmosphere - Physical unit: [ W/m2 ] - Accuracy unit: [ W/m2 ].
InstrumentStatus/
Accuracy
Instrument DescriptionMeasurement TechnologyTimeline
ABI
Advanced Baseline Imager
Operational
Detects clouds, cloud properties, water vapour, land and sea surface temperatures, dust, aerosols, volcanic ash, fires, total ozone, snow and ice cover, vegetation index.n/a
CERES
Cloud and the Earth's Radiant Energy System
Operational
Long term measurement of the Earth's radiation budget and atmospheric radiation from the top of the atmosphere to the surface; provision of an accurate and self-consistent cloud and radiation database.n/a
CLARA
Compact Lightweight Absolute Radiometer
Operational
CLARA is a scientific instrument that will be used to determine the total solar irradiance of the Sun.n/a
GOME-2
Global Ozone Monitoring Experiment - 2
Operational
Measurement of total column amounts and stratospheric and tropospheric profiles of ozone. Also amounts of H20, NO2, OClO, BrO, SO2 and HCHO.n/a
SIM
Spectral Irradiance Monitor
Operational
+/-2 %
Measures solar spectral irradiance in the 200 - 2000 nm range.n/a
SIM
Solar Irradiation Monitor
Operational
Solar irradiance monitoring.n/a
SIM-2
Solar Irradiation Monitor-2
Operational
Solar irradiance monitoring.n/a
SOLSTICE
SOLar STellar Irradiance Comparison Experiment
Operational
+/-2 %
Measures solar UV spectral irradiance (115 - 310 nm) with resolution of 0.1 nm and with an absolute accuracy of 2% and relative stability of 0.3% per year. Compares solar UV output with UV radiation of stable bright blue stars.n/a
TIM
Total Irradiance Monitor
Operational
Measurement of total solar irradiance directly traceable to SI units with an absolute accuracy of 0.03% and relative accuracy of 0.001% per year.n/a
TSIS-1
Total Solar and Spectral Irradiance Sensor 1
Operational
0.2 - 2 µm solar spectral irradiance monitor and total spectra monitorn/a
XPS
XUV Photometer System
Operational
Measure the extreme UV solar irradiance from 1 - 35 nm with absolute accuracy of 20% and relative stability of 1% per year.n/a
TSIS-2
Total Solar and Spectral Irradiance Sensor 2
Being developed
0.2 - 2 µm solar spectral irradiance monitor and total spectra monitorn/a
ERM-2
Improved Earth Radiation Measurement
Approved
Measures Earth radiation gains and losses on regional, zonal and global scales.n/a
* Description adapted from WMO.
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