Blackbody as Transformer of Radiation

Our blackbody model, which has a high frequency cut-off scaling with temperature, absorbs all incoming radiation (forcing), re-emits frequencies below cut-off and stores frequencies above cut-off as internal energy, which is assumed to be equally distributed over frequencies below cut-off.

The result is that a blackbody subject to forcing with frequencies above cut-off, will heat up with a corresponding increase of cut-off until the highest frequency of the forcing is reached, assuming the blackbody is not somehow cooled. The effect is that the blackbody acts as a transformer of radiation from high to low frequencies by absorbing frequencies above current cut-off while emitting frequencies below cut-off.

The Earth subject to forcing from the Sun acts as such a transformer, see Blackbody: Transformer of Radiation.


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