Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..268u&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 268-277.
Astronomy and Astrophysics
Astrophysics
12
Alkali Metals, Frequency Distribution, Helioseismology, Resonance Lines, Solar Atmosphere, Solar Spectra, Atmospheric Models, Photosphere, Radiative Transfer
Scientific paper
This paper investigates the formation of the Na I D2, K I 769.9 nm and Ba II 455.4 nm resonance lines in the solar atmosphere allowing for partial frequency redistribution (PRD). We show that the influence of PRD is negligible on the solar disk in all three lines for a model of the average quiet-Sun, and even for the more extreme case of a model with a steeper photospheric temperature decline. At the solar limb PRD does affect the intensity profile of the Na I and Ba II resonance lines, but not that of the K I line. Finally, we find that effects of PRD are more pronounced at the limb in the Na I D2 and Ba II 455.4 nm lines when the photospheric temperature gradient is steep.
Bruls H. M. J. J.
Uitenbroek Han
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