Physics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...94...49a&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 94, Aug. 1984, p. 49-56.
Physics
32
Absorption Spectra, Solar Limb, Solar Spectra, Iron, Line Spectra, Meridional Flow, Solar Granulation
Scientific paper
Low-noise limb-effect observations of the non-magnetic line Fe I 557.6 nm are presented. Separate measurements along the solar equator and the meridian have been carried out and have been corrected for scattered light. The limb-effect line shifts at the pole and at the equatorial limb are found to be equal. The detailed shape of the limb effect along the meridian is found to differ significantly from that along the equator. This difference can be explained by the presence of a meridional circulation pattern, with horizontal flows less than 50 m/s from both the equator and poles toward + or - 45 deg latitude. Alternatively, the meridian/equator difference may be caused by a combination of latitude dependence of the granular parameters. An increase with latitude of the granular velocity scale height, contrast, or mean sizes could explain the observations.
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