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Area Lighting / Radiation, quantities and units

IEV ref 845-21-106

Symbol
av

en
luminous extinction coefficient, <of the atmosphere>
measure that expresses the attenuation of the direct illuminance when the Sun's rays cross vertically the pure and dry atmosphere (Rayleigh atmosphere)

a v = 0,1 1+0,0045m MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aadggadaWgaaWcbaGaaeODaaqabaGccqGH9aqpdaWcaaqaaiaaicda caGGSaGaaGymaaqaaiaaigdacqGHRaWkcaaIWaGaaiilaiaaicdaca aIWaGaaGinaiaaykW7caaI1aGaaGjbVlaad2gaaaaaaa@466C@

where m is the relative optical air mass weighted to take account of the relative spectral transmittance characteristics of the atmosphere

Note 1 to entry: The luminous extinction coefficient has unit one.


fr
coefficient d'extinction lumineuse, <de l'atmosphère> m
mesure qui exprime l'affaiblissement de l'éclairement direct lorsque les rayons du Soleil croisent verticalement l'atmosphère pure et sèche (atmosphère de Rayleigh)

a v = 0,1 1+0,0045m MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aadggadaWgaaWcbaGaaeODaaqabaGccqGH9aqpdaWcaaqaaiaaicda caGGSaGaaGymaaqaaiaaigdacqGHRaWkcaaIWaGaaiilaiaaicdaca aIWaGaaGinaiaaykW7caaI1aGaaGjbVlaad2gaaaaaaa@466C@

m est la masse d'air optique relative pondérée afin de tenir compte des caractéristiques du facteur de transmission spectrale relative de l'atmosphère

Note 1 à l'article: L'unité de coefficient d'extinction lumineuse est un.


ar
معامل الإخماد الضيائي, <للغلاف الجوى>

de
Lichtextinktionskoeffizient, <der Atmosphäre> m

it
coefficiente di estinzione luminosa, <dell'atrmosfera>

ko
발광 소멸계수, <대기>

ja
発光減衰係数
発光消衰係数

pl
współczynnik ekstynkcji świetlnej, <atmosfery> m

pt
coeficiente de extinção luminosa, <da atmosfera>

zh
光度消光系数, <大气层的>

Publication date: 2020-12
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