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In astrophysics, irradiance is called radiant flux. [1] Spectral irradiance is the irradiance of a surface per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.
Radiant intensity is used to characterize the emission of radiation by an antenna: [2], = (), where E e is the irradiance of the antenna;; r is the distance from the antenna.; Unlike power density, radiant intensity does not depend on distance: because radiant intensity is defined as the power through a solid angle, the decreasing power density over distance due to the inverse-square law is ...
Irradiance of a surface per unit frequency or wavelength. This is sometimes also confusingly called "spectral intensity". This is sometimes also confusingly called "spectral intensity". 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 ...
In radiometry, radiant exposure or fluence is the radiant energy received by a surface per unit area, or equivalently the irradiance of a surface, integrated over time of irradiation, and spectral exposure is the radiant exposure per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.
The terms irradiance, radiant exitance, radiant emittance, and radiosity are closely related to spectral flux density. The terms used to describe spectral flux density vary between fields, sometimes including adjectives such as "electromagnetic" or "radiative", and sometimes dropping the word "density". Applications include:
Irradiance of a surface per unit frequency or wavelength. This is sometimes also confusingly called "spectral intensity". This is sometimes also confusingly called "spectral intensity". 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 ...
A flow chart describing the relationship of various physical quantities, including radiant flux and exitance. In radiometry, radiant flux or radiant power is the radiant energy emitted, reflected, transmitted, or received per unit time, and spectral flux or spectral power is the radiant flux per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency ...
Mathematically, for the spectral power distribution of a radiant exitance or irradiance one may write: =where M(λ) is the spectral irradiance (or exitance) of the light (SI units: W/m 2 = kg·m −1 ·s −3); Φ is the radiant flux of the source (SI unit: watt, W); A is the area over which the radiant flux is integrated (SI unit: square meter, m 2); and λ is the wavelength (SI unit: meter, m).