| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
AMI
Advanced Meteorological Imager | Operational
| Continuous monitoring capability for the near real-time generation of high-resolution meteorological products and long-term change analysis of land/sea surface temperature and cloud coverage. | Multi-purpose imaging Vis/IR radiometer |  |
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 | |
ERM-1
Earth Radiation Measurement | Operational
| Measures Earth radiation gains and losses on regional, zonal and global scales. | n/a | |
ERM-2
Improved Earth Radiation Measurement | Operational
| Measures Earth radiation gains and losses on regional, zonal and global scales. | n/a | |
GERB
Geostationary Earth Radiation Budget | Operational
| Measures long and short wave radiation emitted and reflected from the Earth's surface, clouds and top of atmosphere. Full Earth disk, all channels in 5 minutes. | 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 | |
MISR
Multi-angle Imaging SpectroRadiometer | Operational
| Measurements of global surface albedo, aerosol and vegetation properties. Also provides multi-angle bidirectional data (1% angle-to-angle accuracy) for cloud cover and reflectances at the surface and aerosol opacities. Global and local modes. | n/a | |
SIM-2
Solar Irradiation Monitor-2 | Operational
| Solar irradiance monitoring. | n/a | |
VIIRS
Visible/Infrared Imager Radiometer Suite | Operational
| Global observations of land, ocean, and atmosphere parameters: cloud/weather imagery, sea-surface temperature, ocean colour, land surface vegetation indices. | Multi-purpose imaging Vis/IR radiometer | |
CLARREO Pathfinder Reflected Solar
CLARREO Pathfinder - RS | Being developed
+/-0.3 % | Demonstration of high accuracy SI-traceable calibration within 350-2300 nm spectral range; demonstration of ability to transfer this calibration to other Earth observing instruments. | Multi-purpose imaging Vis/IR radiometer | |
BBR (EarthCARE)
BroadBand Radiometer (EarthCARE) | Approved
| Top of the atmosphere radiances and radiative flux. | n/a | |