Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143..116c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 1, Feb. 1985, p. 116-121. Research supported by the Universita di Fir
Astronomy and Astrophysics
Astrophysics
39
Fraunhofer Lines, Photosphere, Red Shift, Solar Activity, Solar Spectra, Spectrum Analysis, Frequency Shift, Iron, Solar Limb, Solar Magnetic Field
Scientific paper
The asymmetry and the red shift of three Fe I solar lines around 6300 A have been measured in active regions with a Fabry-Perot spectrometer. At the disk center, the active region line bisectors are always displaced to the red and their shape is heavily modified. This red-shift nearly compensates the convective blue-shift for strong magnetic fields, suggesting that the inhibition of convection in magnetic regions might be responsible for the red-shift instead of the often invoked 'downdraft'. Moving from the center to the limb, at about 0.56 solar radii, the red-shift changes to a slight blue shift. This effect might explain, without the need of invoking a poleward meridional flow, why the center to limb red-shift of the line wavelengths is found to be smaller along the solar equator than along the meridian on large ensembles of data.
Cavallini Fabio
Ceppatelli Guido
Righini Alberto
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