Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..237b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 237-256.
Astronomy and Astrophysics
Astrophysics
81
Alkali Metals, Helioseismology, Resonance Lines, Solar Atmosphere, Solar Spectra, Thermodynamic Equilibrium, Photosphere, Solar Oscillations
Scientific paper
We study the NLTE formation of the solar K I and Na I resonance lines employed in helioseismology. We combine standard modeling of the solar atmosphere with comprehensive alkali model atoms, complete up to the Rydberg regime near the continuum, to study various NLTE mechanisms which interact to make the alkali population balances more complex than is the case for other minority species. In particular, we discuss a 'photon suction' process which produces overpopulation of the neutral stage by driving a population flow from the reservoir in the singly ionized stage. We isolate this and other mechanisms with specifically tailored model atoms, and we provide a choice of simplified model atoms, trading precision against size, which are appropriate for future use in numerical simulations of the solar atmosphere.
Bruls H. M. J. J.
Rutten Robert J.
Shchukina Nataliya G.
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