Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..257b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 257-267.
Astronomy and Astrophysics
Astrophysics
28
Alkali Metals, Helioseismology, Resonance Lines, Solar Granulation, Solar Spectra, Thermodynamic Equilibrium, Atmospheric Models, Solar Atmosphere
Scientific paper
We model the NLTE formation of the solar Na I and K I resonance lines for an array of one-dimensional atmospheric models taken from a numerical simulation of the solar granulation by Nordlund and Stein (1990, 1991). We discuss the nature of alkali-line sensitivity to granulation using hot and cool extremes from the simulation and we study the granular modulation of diagnostics such as line bisectors and helioseismological resonance-cell response. We also show that granular structuring produces apparent spatially-averaged line broadening of similar magnitude as the ad-hoc microturbulent and damping broadening invoked in traditional plane-parallel modeling.
Bruls H. M. J. J.
Rutten Robert J.
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