Based on Planck's Law, the radiation curves of black bodies at different temperatures do not cross.
If this is the case, then the radiation curves for Sun and Earth should not cross as well.
This means, sun radiation is always above earth radiation at ALL wavelength.
Then why do we say in RS that, the far infrared is mainly the emissive band from the earth, and that from the sun can be ignored? Even though the ratio of far infrared in sun radiation is very low, but the total energy is still above that in earth radiation, isn't it?
Kevin Hamilton Hi Kevin thank you very much for the reply!
so "multiply the solar temperature black body function at all wavelengths by (R/r)**2"
- is this the sun radiation left when it reaches the surface of the earth, regardless of the reduction by atmosphere?
You also follow this paper
https://www.sciencedirect.com/topics/earth-and-planetary-sciences/infrared-radiation
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