SOLAR RADIATION MEASUREMENT ON SHENZHOU-3 SPACECRAFT

TSI （Total Solar Irradiance） has been measured by solar constant monitor, which is composed of three SIAR （Solar Irradiance Absolute Radiometer）, on board of Shenzhou-3 spacecraft from March to September in 2002. The structure of the cavities has been improved, the substitution winding being embedded in the wall of each SIAR’s cavities, so the absolute precision is heightened. Solar irradiance was measured when the sun scans over the field of view of each absolute radiometer respectively. The data is coincident with the data simultaneously measured by EOS/ACRIM in 0.2%.