Spectral flux density

In spectroscopy, spectral flux density is the quantity that describes the rate at which energy is transferred by electromagnetic radiation through a real or virtual surface, per unit surface area and per unit wavelength. It is a radiometric measure, as distinct from measures that characterize light in terms of the electromagnetic field or photons. In SI units it is measured in W m⁻³, although it can be more practical to use W m⁻² nm⁻¹ (1 W m⁻² nm⁻¹ = 1 GW m⁻³ = 1 W mm⁻³) or W m⁻² μm⁻¹ (1 W m⁻² μm⁻¹ = 1 MW m⁻³), W·m⁻²·Hz⁻¹, Jansky or solar flux units. 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:

For the flux density received from a remote unresolvable "point source", the measuring instrument, usually telescopic, though not able to resolve any detail of the source itself, must be able to optically resolve enough details of the sky around the point source, so as to record radiation coming from it only, uncontaminated by radiation from other sources. In this case,spectral flux density is the quantity that describes the rate at which energy transferred by electromagnetic radiation is received from that unresolved point source, per unit receiving area facing the source, per unit wavelength range.

At any given wavelength λ, the spectral flux density, F_λ, can be determined by the following procedure:

...
Wikipedia