Light carries a certain amount of energy. If this is absorbed by a surface, this energy is usually transformed into heat. The radiation power per surface area is the amount of energy in the sunlight that strikes a unit surface area per unit time. This power is different for different wavelengths (en.wikipedia.org/wiki/Sunlight...viewer/File:Solar_Spectrum.png). Not all of this power is absorbed by the surface however, actually, most of it is reflected by a lot of metals. The percentage of the power that is reflected also depends on the wavelength (see for example en.wikipedia.org/wiki/Reflecti...le:Image-Metal-reflectance.png). So if you want to do it correctly you need a graph of the absorbance as a function of wavelength of the material that you are using, and multiply it with the solar spectrum outside the atmosphere, and then integrate over all wavelengths to know the total amount of heat generated per second and per unit surface area of your satellite.
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