from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a body that radiates energy having a blackbody distribution reduced by a constant factor
Sorry, no etymologies found.
This is a major problem with applying the the graybody Stefan-Boltzman approach to an object that is not a graybody.
Earth is not a graybody, effects at specific narrow wavelength bands are important, heat transport and altitude effects matter, the surface is not the top of atmosphere, and so on – so it is not appropriate to ignore all this and rely on SB for calculations of surface temperatures.
For a graybody one adds an emissivity term, and for a real body one adds a wavelength or frequency subscript to the emissivity term and accounts for the fraction of radiation output in the range of interest.