Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231..221b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 1, May 1990, p. 221-234. Research supported by DFG.
Astronomy and Astrophysics
Astrophysics
53
Faculae, Line Spectra, Solar Magnetic Field, Solar Spectra, Stellar Magnetic Fields, Zeeman Effect, Line Shape, Magnetic Flux, Red Shift
Scientific paper
Results are presented of an analysis of high-quality Fourier transform spectrometer spectra obtained in facular regions near solar disk center having different amounts of magnetic flux or, equivalently, different filling factors, alpha. The line parameters (width, equivalent width, depth, bisector shape, and wavelength) of 32 spectral lines and their variation with alpha are studied. Line depth is seen to decrease with increasing filling factor for all the observed lines, while the line width increases, even after compensation has been made for the Zeeman broadening. For strong or temperature-insensitive lines the equivalent width stays practically unchanged, but decreases for weak lines. The findings are qualitatively explained by a decrease in the contrast between the upflow and downflow components of the nonmagnetic part of the atmosphere in active regions (abnormal granulation) coupled to either a decrease in the average temperature of the nonmagnetic part or a significant increase in small-scale velocity.
Brandt Peter N.
Solanki Sami K.
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