Astrophysics (index)

Emission Coefficient

(j)
(measure of how much light a substance emits)

An Emission Coefficient (often indicated as j) is a measure of Electromagnetic Radiation (EMR) (e.g., light) Emission of a substance in a particular direction added to EMR passing through in that particular direction. They are used for modeling the effect of gas on passing EMR. It is a ratio of the EMR emitted to that entering the substance over a standard length through the substance. It will depend upon the substance and its density. It is the inverse of an Absorption Coefficient.


(physics,EMR,measure,emission)
http://en.wikipedia.org/wiki/Einstein_coefficients
http://astronomy.nmsu.edu/nicole/teaching/ASTR505/lectures/lecture19/slide01.html

Referenced by:
Absorption Coefficient
Equation of Radiative Transfer (RTE)
Source Function (S)

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