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Two-stream Approximation

(approximation of a star's internal EMR's divergence from isotropic)

A Two-stream Approximation is an approximation of Electromagnetic Radiation Intensity as a function of direction, i.e., a description of how intense the light is when viewed in different directions, for example, within an Atmosphere. It is a simplification of reality that makes calculations of Radiative Transfer and Absorption Lines tractable. It is "two-stream" for making a distinction between "down" and "up", essentially, assuming more light is moving up, or away from the center of the object.

There are variants, two of which are the Eddington Approximation and the Schuster-Schwarzschild Model.

(physics,EMR,stars,radiative transfer)

Referenced by:
Schuster-Schwarzschild Model