Irradiance

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Related to Irradiance: Solar irradiance

irradiance

[i′rād·ē·əns]

(electromagnetism)

radiant flux density

Irradiance

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

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

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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.

Optical properties of the waters of the southern Gulf of Mexico during summer

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.

Improvements on the Incremental Conductance MPPT Method Applied to a PV String with Single-Phase to Three-Phase Converter for Rural Grid Applications

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.

BUILDING THE SUN4CAST SYSTEM: Improvements in Solar Power Forecasting: The Sun4Cast System results from a research-to-operations project built on a value chain approach, benefiting electric utilities' customers, society, and the environment by improving state-of-the-science solar power forecasting capabilities

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.

Study of Temperature Coefficients for Parameters of Photovoltaic Cells

As June to September is the rainy season in Bangladesh, the recorded solar irradiance becomes lower in these months.

Dynamic Modelling of a Solar Water Pumping System with Energy Storage

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.

SUNBURNING SOLAR RADIATION IN CENTRAL INDIANA

In this study, protein staining was more intense in leaves harvested in a cold, low light irradiance day (day 12th), when compared to leaves harvested in a warm ([approximately equal to] 28 [degrees]C, at the harvest time), high light irradiance day (10th).

Effects of changes in micro-weather conditions on structural features, total protein and carbohydrate content in leaves of the Atlantic rain forest tree golden trumpet (Tabebuia chrysotricha)/ Efeito de alteracoes nas condicoes micro-climaticas sobre caracterfsticas estruturais, e protefna e carboidratos histoquimicamente marcados, de folhas da arvore da floresta Atlantica ipe amarelo

Panel output characteristics depending not only the current flow in the circuit because irradiance falling on the panel will change the current flow.

Maximum power point tracking based stand alone photovoltaic system using PSO algorithm

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).

Diurnal and seasonal experimental performance of a solar collector-cum-regenerator

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.

Calculating the sun's photospheric temperature, an undergraduate physics laboratory

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.