| CEOS EO HANDBOOK – MEASUREMENT INSTRUMENTS
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Measurements > Atmosphere >
Radiation budget >
Solar Spectral Irradiance
  | Measurement Definition*: Wavelength-dependent energy input to the top of the Earth's atmosphere, at a standard distance of one Astronomical Unit from the Sun - Physical unit: [ W m-2 nm-1]
Thematic Links |
| Instrument | Status/
Accuracy | Instrument Description | Measurement Technology | Timeline |
SIMBA Instrument
SIMBA Instrument | Operational
| Achieve a high absolute accuracy by employing the same instrument for the very first time to measure irradiance from both the Sun and Earth. The CubeSat will turn from our planet to deep space – for calibration purposes – then to our parent star. | n/a | |
HIS
Hyperspectral imaging Spectrometer | Being developed
| Pushbroom-type dual-prism Imaging Spectrometer with high radiometric accuracy and medium Signal-to-noise Ratio, operating from UV (320 nm) to SWIR (2400 nm) , based on a single MCT Detector/focal plane. The HIS aims at accurate spectral imaging on land and ocean for climatological background radiometric data acquistion and supporting cross-calibration with other stellites/sensors and on PICS/instrumented sites with highest resolution (50 m) | n/a | |
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* Description adapted from WMO.
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