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Radiation Flux

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Radiation Flux 

the total energy transmitted by optical radiation (at all frequencies present in the radiation) per unit time across a given surface. For an absorbing surface, radiation flux is the sum of the absorbed and reflected energies. The concept of radiation flux applies to time intervals that are considerably longer than the period of the light vibrations.



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The author explains the radiation flux in the free atmosphere and biosphere and concentrates on such processes as photosynthesis and photoperiodism.
Radiation flux can be calculated from the temperature and emissivity of the object applying the Kirchhoff and Stefan-Boltzmann laws [E.
 
 
 
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