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 ?
6 Latitude ([degrees]N) 21.50 21.50 Longitude ([degrees]W) 92.50 92.25 Profile time (GMT-6, h:min) 11:39 13:36 Total depth (m) 264 74 Euphotic layer thickness (m) 90 70 Average extinction coefficient (k) 0.23 0.16 Incident irradiance [E.sub.0], ([micro]mol [m.sup.-2] [s.sup.-1]) 272.40 175 Compensation depth, [Z.sub.c] (m) 8.58 10.97 Critical depth [Z.sub.cr] (m) 9.54 13.64 Mixed layer (m) 15 20 Integrated chlorophyll (mg [m.sup.-2]) 2.70 1.70 Maximum chlorophyll depth (m) 76 58 Chlorophyll at the maximum (mg [m.sup.-3]) 0.20 0.40 Irradiance at chlorophyll maximum (%) 1.60 3.60 Upwelling radiance ([L.sub.u](chla) (nE [m.sup.-2] [s.sup.-1] [str.sup.-1]) at 2.80 0.31 the chlorophyll maximum The temperature at the chlorophyll maximum ([degrees]C) 22 22 St.
2, and assuming that for each curve all of the PV cells are submitted to the same temperature and irradiance conditions, it can be seen there is one and only one maximum point, which corresponds to the global maximum point.
While this consensus forecasting approach has been applied to forecasting more common weather variables (e.g., air temperature), it had not previously been applied to solar irradiance forecasting in any significant way.
The important parameters of the four photovoltaic cells are obtained using the SolarLab system, the I-V characteristics, the-one diode model, and the analytical five-point method [10, 28] at different temperatures and different irradiance.
As June to September is the rainy season in Bangladesh, the recorded solar irradiance becomes lower in these months.
Figure 2 presents the computed solar spectral irradiance [dE.sub.TOT]([lambda], [theta])d[lambda] as a function of wavelength from 290 nm to 400 nm under clear, hazefree skies.
Panel output characteristics depending not only the current flow in the circuit because irradiance falling on the panel will change the current flow.
The ratio of the day average evaporation flux of vapor to the day average irradiance was 0.634 kg/kWh (0.0004 lb/Btu) for the mean Ca[Cl.sub.2] concentration in the solution of 0.4 kg/kg (0.4 lb/lb).
The first, called direct normal solar irradiance (DNSI), requires limiting the field of view to 6 [degrees] centered on the sun, which can be accomplished with a simple tube (see Figure 2) and a bare fiber optic cable.
As SeaWiFS has demonstrated, the USGS model can predict changes in lunar spectral irradiance at a given lunar phase and within a given passband at the sub-percent level.