Principles of Invariance in Radiative Transfer

Author: Peraiah A.

Source: Space Science Reviews, Volume 87, Number 3-4, 1999 , pp. 465-538(74)

Publisher: Springer

Abstract:

We have reviewed the principle of invariance, its applications and its usefulness for obtaining the radiation field in semi-infinite and finite atmospheres. Various laws of scattering in dispersive media and the consequent radiation field are studied. The H-functions and X- and Y-functions in semi-infinite and finite media respectively are derived in a few cases. The Discrete Space Theory (DST) which is a general form of the Principle of Invariance is described. The method of addition of layers with general properties, is shown to describe all the properties of multiple scattering. A few examples of the application of DST such as polarization, line formation in expanding stellar atmospheres, etc., and a numerical analysis of DST are presented. Other developments in the theory of radiative transfer are briefly described.

Language: English

Document Type: Regular paper

Affiliations: 1: Indian Institute of Astrophysics, Koramangala, Bangalore 560 034, India

Publication date: 1999-01-01

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