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irradiance

(EMR power reaching a surface)

Irradiance is the amount of electromagnetic radiation (EMR) (quantified by its energy) per unit time (i.e., power) striking a surface per unit area, from any direction. It is conceptually the sum of the intensity (i.e., radiance) from all directions. Typical units:

Spectral irradiance is irradiance per wavelength or frequency.


(measure,EMR)
Further reading:
http://en.wikipedia.org/wiki/Irradiance

Referenced by pages:
flux density
insolation
radiative flux
Solar Maximum Mission (SMM)
Upper Atmosphere Research Satellite (UARS)
watt (W)

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