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Radiative flux
Radiative flux, also known as radiative flux density or radiation flux, is the amount of power radiated through a given area, in the form of photons or other elementary particles, typically measured in W/m2.〔(【引用サイトリンク】title=Glossary of Meteorology: Radiative Flux )〕 It is used in astronomy to determine the magnitude and spectral class of a star. Radiative flux also acts as a generalization of heat flux, which is equal to the radiative flux when restricted to the infrared spectrum.
When radiative flux is incident on a surface, it is often called irradiance. Flux emitted from a surface may be called radiant exitance or radiant emittance.
==Shortwave radiation flux==
Shortwave flux is a result of specular and diffuse reflection of incident shortwave radiation by the underlying surface. This shortwave radiation, as solar radiation, can have a profound impact on certain biophysical processes of vegetation, such as canopy photosynthesis and land surface energy budgets, by being absorbed into the soil and canopies.〔http://www.geo.hunter.cuny.edu/~wenge/publications/Yang_JGR_01.pdf Retrieved 2010-09-15〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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