Astrophysics (Index)About

irradiance

(EMR power reaching a surface)

Irradiance is the amount of electromagnetic radiation (EMR) per unit time (quantified as the EMR's power, i.e., energy per unit time) 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:
https://en.wikipedia.org/wiki/Irradiance
https://glossary.ametsoc.org/wiki/Irradiance
https://glossary.ametsoc.org/wiki/Spectral_irradiance
https://dictionary.obspm.fr/index.php?showAll=1&formSearchTextfield=irradiance
https://www.rp-photonics.com/irradiance.html

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

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