Temperature variation of scan mirror of 3-aixs stability satellite operating in geostationary orbits

The thermal analysis was performed to get the temperature variations of the scan mirror onboard geostationary meteorological satellite. The calculating model of scan mirror was established and temperature variations of the mirror were calculated by I-DEAS/TMG software. The calculating results show that the highest temperature of the scan mirror in 24 hours occurs at the period of local midnight and the average temperature with the solar declination-8.8 deg would be higher than that of any other period. After the thermal control is applied to the scan mirror, the mirror temperature can be reduced to a low level obviously. At the period of the local midnight, the temperature differences on the scan mirror change acutely. The temperature difference on the major axis is obviously greater than that on the minor axis for the elliptical scan mirror.