Irradiance


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Related to Irradiance: Solar irradiance

irradiance

[i′rād·ē·əns]
(electromagnetism)

Irradiance

The amount or density of light energy incident on a surface.

Irradiance

 

(at a point of a surface), the ratio of the radiant flux incident upon a small surface element containing the point being considered to the area of the surface element. In meteorology and actinometry, this quantity is also called radiation intensity. Units of irradiance are watts per square meter and calories per square centimeter per minute.

irradiance

The density of the luminous flux which is incident on a surface.
References in periodicals archive ?
The GWC real-time irradiance forecasts provide accurate, actionable information for those relying on solar generation to meet customer demands.
Higher-wattage light sources were correlated with higher UV-A irradiance emitted.
4], "calibration of the solar reflectance bands presented a problem in that none of the calibration sources available from the NBS, either the radiance or irradiance standards, could begin to fill the 10-cm aperture (of the sensor optics) in a way that simulated an extended source, such as earth.
Southern Africa's natural irradiance is also at high levels during winter.
XenoLogic is a twin-lamp operating technology which enables the instrument to achieve high irradiance levels of 120 W/[m.
Varied doses of UVB radiation were administered to budgerigars by altering exposure time and irradiance.
When primary production is modelled for longer than diurnal time-scales, diel variations of light intensity are commonly ignored and the mean daily photosynthetically available irradiance (PAR) is used to estimate primary production.
Other topics include three-dimensional dust radiative transfer, the dawn of chemistry, solar irradiance variability and climate, modeling the panchromatic spectral energy distributions of galaxies, and nucleosynthesis in stars and the chemical enrichment of galaxies.
Over the years, various chapters of the ASHRAE Handbook--Fundamentals have provided a method to estimate clear-sky (cloud-free) irradiance values for use with cooling load estimation methods and other applications.