Determination of turbulent velocity in the solar photosphere from weak CN lines in the 4179-4213 A spectral region

Astronomy and Astrophysics – Astronomy

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Atmospheric Turbulence, Cyanogen, Line Shape, Photosphere, Ultraviolet Spectra, Velocity Distribution, Atmospheric Boundary Layer, Doppler Effect, Solar Atmosphere, Spectral Bands

Scientific paper

Weak cyanogen-line profiles (the violet system of bands with υ' - υ" = -1) are analyzed with the aim of redetermination of turbulent velocities in the upper layers of the solar photosphere. From the Liège Solar Atlas some spectral regions of the width 0.3 - 0.6 Å were examined. For the solar disk center resulting Doppler widths, central depths and improved central wavelengths of the elemental components of the cyanogen blends have been obtained. The determined vertical component of the total photospheric velocity field ξ = 2.1 km s-1 has been found to be appreciably smaller than the value ξ = 3.5 km s-1 obtained earlier from the analysis of mean-resolution spectra of CN.

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