THE CEOS DATABASE : Missions, Instruments and Measurements
CEOS EO HANDBOOK – INSTRUMENT SUMMARY - ACRIM III -
Full Name Active Cavity Radiometer Irradiance Monitor Status No longer operational
Instrument Agencies NASA Maturity
Instrument Type Earth radiation budget radiometers Geometry
Instrument Technology Solar irradiance monitor Sampling Sounding
Data Access Open Access Data Format HDF-EOS
Measurements and Applications Measurements of solar luminosity and solar constant. Data used as record of time variation of total solar irradiance, from extreme UV through to infrared.
Resolution Summary 5 deg FOV
Swath Summary 71 mins per orbit of full solar disk data
Accuracy Summary 0.1% of full scale
Waveband Summary UV - MWIR: 0.15 - 5 µm
UV (~0.01 µm - ~0.40 µm)
VIS (~0.40 µm - ~0.75 µm)
NIR (~0.75 µm - ~1.3 µm)
SWIR (~1.3 µm - ~3.0 µm)
MWIR (~3.0 µm - ~6.0 µm)
Instrument Measurements
CategoryParameterAccuracy
Radiation budgetDownwelling (Incoming) solar radiation at TOA 
Instrument Missions
ACRIMSAT - Active Cavity Radiometer Irradiance Monitor (1999 - 2013)
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