from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Alternative spelling of graybody.
Sorry, no etymologies found.
You will usually see the term 'greybody' in a somewhat different context, describing bulk materials with optical properties that are invarient with respect to wavelength, as opposed to redbody, bluebody, etc.
My introduction of 'greybody' was a bit clumsy - although different from its normal usage,
Guthrie, Earth's surface is a blackbody, it's the gas atmosphere that is a greybody.
I thought the earth was a greybody, not black, due, IIRC, to all the funky chemistry/ physics going on in the atmosphere.
… And greybody in the more usual context would not automatically imply that there is any reflection; I've seen it used to describe the hypothetical case of an atmosphere that absorbs the same fraction of radiation over a given distance at any wavelength within the LW portion of the spectrum.
… And greybody in the more usual context would not automatically imply that there is any reflection; …
Perhaps the most interesting realization is that the concept of reciprocity applies to the ‘kludge’ factor called emissivity – the correction value that permits a greybody to be modeled with planck’s law and stefan’s law – applies to the atmosphere.