Spectral hemispherical attenuation coefficient Radiant flux absorbed and scattered by a volume per unit length, divided by that received by that volume. Spectral radiance transmitted by a surface, divided by that received by that surface. Radiance transmitted by a surface, divided by that received by that surface. Spectral flux transmitted by a surface, divided by that received by that surface. Radiant flux transmitted by a surface, divided by that received by that surface. Spectral radiance reflected by a surface, divided by that received by that surface.
Radiance reflected by a surface, divided by that received by that surface. Spectral flux reflected by a surface, divided by that received by that surface. Radiant flux reflected by a surface, divided by that received by that surface. This should not be confused with " spectral absorbance". Spectral radiance absorbed by a surface, divided by the spectral radiance incident onto that surface. This should not be confused with " absorbance". Radiance absorbed by a surface, divided by the radiance incident onto that surface. Spectral flux absorbed by a surface, divided by that received by that surface. Radiant flux absorbed by a surface, divided by that received by that surface. Spectral radiance emitted by a surface, divided by that of a black body at the same temperature as that surface. Radiance emitted by a surface, divided by that emitted by a black body at the same temperature as that surface. Spectral exitance of a surface, divided by that of a black body at the same temperature as that surface. Radiant exitance of a surface, divided by that of a black body at the same temperature as that surface. This is sometimes also called "spectral fluence". The latter is commonly measured in J⋅m −2⋅nm −1. Radiant exposure of a surface per unit frequency or wavelength. This is sometimes also called "radiant fluence". Radiant energy received by a surface per unit area, or equivalently irradiance of a surface integrated over time of irradiation. This is sometimes also confusingly called "spectral intensity".
"Spectral emittance" is an old term for this quantity. The latter is commonly measured in W⋅m −2⋅nm −1. Radiant exitance of a surface per unit frequency or wavelength. This is sometimes also confusingly called "intensity". "Radiant emittance" is an old term for this quantity. This is the emitted component of radiosity. Radiant flux emitted by a surface per unit area. Radiosity of a surface per unit frequency or wavelength. Radiant flux leaving (emitted, reflected and transmitted by) a surface per unit area. Non-SI units of spectral flux density include jansky (1 Jy = 10 −26 W⋅m −2⋅Hz −1) and solar flux unit (1 sfu = 10 −22 W⋅m −2⋅Hz −1 = 10 4 Jy). Irradiance of a surface per unit frequency or wavelength. Radiant flux received by a surface per unit area. Watt per steradian per square metre, per metre The latter is commonly measured in W⋅sr −1⋅m −2⋅nm −1. Radiance of a surface per unit frequency or wavelength. Watt per steradian per square metre per hertz Radiant flux emitted, reflected, transmitted or received by a surface, per unit solid angle per unit projected area. The latter is commonly measured in W⋅sr −1⋅nm −1. Radiant intensity per unit frequency or wavelength. Radiant flux emitted, reflected, transmitted or received, per unit solid angle. The latter is commonly measured in W⋅nm −1. Radiant flux per unit frequency or wavelength. This is sometimes also called "radiant power", and called luminosity in Astronomy. Radiant energy emitted, reflected, transmitted or received, per unit time.
Radiant flux, denoted Φ e ("e" for "energetic", to avoid confusion with photometric quantities), is defined as Φ e = ∂ Q e ∂ t, 2 Relationship with the Poynting vector.
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