Non-LTE resonance line polarization with partial redistribution effects

Details Non-LTE resonance line polarization with partial redistribution effects Non-LTE resonance line polarization with partial redistribution effects

Publishing date

Nov 1982

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115....1r&link_type=abstract

Journals

Astronomy and Astrophysics, vol. 115, no. 1, Nov. 1982, p. 1-7. Research supported by the University of Sydney and Australian Re

Science

Astronomy and Astrophysics

Field

Astrophysics

Additional info 2

63

Additional info 3

Atmospheric Models, Linear Polarization, Resonance Lines, Solar Atmosphere, Solar Spectra, Atmospheric Scattering, Coherent Scattering, Line Spectra, Radiative Transfer, Thermodynamic Equilibrium, Transfer Functions

Type

Scientific paper

Abstract

The physics of formation of non-LTE resonance line polarization is studied for a two-level atom. Partial redistribution effects are included via an approximate treatment of the case of coherent scattering in an atomic rest frame in which the upper atomic level is naturally broadened. The transfer equations are solved in finite and semi-infinite model atmospheres and the relevance of the solutions to solar observations is discussed. In particular, qualitative agreement is obtained with the linear polarization profiles of Ca I 4227 A, NaD2, and Ca II K observed by Stenflo et al. (1980). These profiles have maxima in the line core and the line wings, contrary to Wiehr's (1981) NaD2 data in which the core maximum is not observed.

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