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Irradiance

(power reaching a surface)

Irradiance is the amount of Electromagnetic Radiation per unit time (power) striking a surface per unit area, from any direction. It is conceptually the sum of the Intensity (i.e., Radiance) from all directions.


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

Referenced by:
Radiative Flux
Solar Maximum Mission (SMM)
Solar and Heliospheric Observatory (SOHO)

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