Asymmetries and wavelengths of solar spectral lines and the solar rotation determined from Fourier-transform spectra

Physics

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Frequency Shift, Line Spectra, Solar Limb, Solar Rotation, Solar Spectra, Atomic Excitations, Fourier Transformation, Gravitational Effects, Red Shift, Solar Atmosphere, Wavelengths

Scientific paper

Wavelength shifts and asymmetries of solar spectral lines and of the solar rotation are determined on the basis of 143 selected lines from Fourier-transform spectra obtained in 1980 and 1981. The asymmetries are noted to strongly depend on the formation layer of the line cores; lines with cores formed at higher layers have larger asymmetries. Wavelength shifts at the solar disk center show a depth dependence similar to that found by Keil (1980), but exhibit an exponential line. Lines with cores formed at higher layers of the solar atmosphere show wavelength shifts of approximately the gravitational redshift. Ionized element line redshifts are larger than those from neutral elements. An equatorial rotation velocity of 1.971 km/sec is found.

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