Resonance-line transfer with partial redistribution. VII Angle-dependent redistribution

Details Resonance-line transfer with partial redistribution. VII Angle-dependent redistribution Resonance-line transfer with partial redistribution. VII Angle-dependent redistribution

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202..250m&link_type=abstract

Astrophysical Journal, vol. 202, Nov. 15, 1975, pt. 1, p. 250-258.

Astronomy and Astrophysics

Astrophysics

35

Chromosphere, Line Spectra, Radiative Transfer, Solar Atmosphere, Angular Distribution, Calcium, Finite Difference Theory, Frequency Distribution, Resonance, Solar Limb, Stellar Spectra, Velocity Distribution

Scientific paper

A method is presented for treating radiative transfer in resonance lines, allowing for the full angle and frequency dependence of redistribution in the scattering process, as seen in the laboratory frame. The case of an equivalent-two-level-atom source function is considered; the problem to be treated is then linear in the radiation field. We apply this method to the Ca II lines in the solar atmosphere, using a redistribution function which takes into account a mixture of coherence in the atom's frame, with Doppler redistribution in the laboratory frame (for atoms which have not suffered an elastic collision), and of complete redistribution in the laboratory frame (for atoms that are collisionally perturbed during the emission process). Both the angle-averaged approximation and the full angle-dependent solution were obtained, and were compared to assess, differentially, the effects of angular redistribution upon the computed line profile and its center-to-limb behavior. For the Ca II line in a homogeneous solar chromosphere the angle-dependent effects are found to be negligible, indicating that one may use angle-averaged redistribution functions when studying partial redistribution effects in line profiles.

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