Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..905a&link_type=abstract
Astrophysical Journal, Part 1, vol. 214, June 15, 1977, p. 905-911.
Astronomy and Astrophysics
Astrophysics
7
Absorption Spectra, Photosphere, Solar Spectra, Spectral Line Width, Atmospheric Circulation, Calcium, H Lines, K Lines
Scientific paper
The depth dependence of nonthermal broadening in the solar photosphere is estimated using the widths of weak absorption features in spatially averaged profiles of the Ca II H and K wings. The inferred vertical component of the photospheric total-motion field does not show a significant depth dependence in constrast to previously proposed models which have sharply inward increasing velocities in the deep photosphere. The mean Gaussian nonthermal broadening obtained is 1.6 + or - 0.1 km/s (one-half full e-folding width). In addition, the inferred nonthermal broadening is used to estimate thermal widths, and therefore also atomic weights, for several weak features in the H and K wings which are unidentified or have uncertain identifications. It is found that the majority of these are consistent with rare-earth absorption.
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