This is done by using a solar radiator coating on the sun side and a metallic reflector on the radiator side. Thus although the sunshield gets hotter, 353 K, than the radiator, 308 K, its emissivity is so low on the side next to the radiator that it does not affect the radiator. This is reflected in the radiating power of 444 W/m2 and the night time temperature of 305 K. The disadvantages of this system are that the vertical sunshield becomes taller as the equator is approached with a practical limit of 15° north or south of the equator and that radiators must be widely spaced to prevent reflected radiation from one sunshield impacting the next radiator. A practical distance is ten times the height of the sunshield.
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