Solar/Stellar Irradiance Comparison Experiment
To compare the UV output of the sun with similar radiation produced by 30 stable, bright blue stars. The stars constitute the standards against which the solar irradiance is measured
Three-channel grating spectrometer to measur solar and stellar irradiation (UV radiation in the ranges 119-190 nm (spectral resolution 0.1 nm), 170-320 nm (resoluion 0.25 nm), and 280-420 nm (resolution 0.35 nm).
Pointing Sun in daylight, one of the 30 calibrating stars during night
Coverage / Cycle
Flown on an R&D satellite
1991 to 2005-12-14
Satellites this instrument is flying on
Note: a red tag indicates satellites no longer operational, a
green tag indicates operational satellites, a blue tag indicates
Earth observation instrument Passive optical radiometer or spectrometer Solar irradiance monitor
No WIGOS subcomponents have been defined.
Tentative Evaluation of Measurements
The following list indicates which measurements can
retrieved from this category of instrument. To see a full Gap Analysis by Variable,
click on the respective variable.
Note: table can be sorted by clicking on the column headers
Variable Relevance for measuring this variable Operational limitations Explanation
Downward short-wave irradiance at TOA 5 - marginal No specific limitation. Spectral irradiance limited to UV and VIS