Some comments on the limb shift of solar lines. III Variation of limb shift with solar latitude, across plages, and across supergranules

Details Some comments on the limb shift of solar lines. III Variation of limb shift with solar latitude, across plages, and across supergranules Some comments on the limb shift of solar lines. III Variation of limb shift with solar latitude, across plages, and across supergranules

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980soph...68...41b&link_type=abstract

Solar Physics, vol. 68, Nov. 1980, p. 41-47.

Physics

21

Fraunhofer Lines, Photosphere, Solar Granulation, Solar Limb, Solar Spectra, Spectroheliographs, Convective Flow, Meridional Flow, Solar Atmosphere, Solar Physics, Spectrum Analysis

Scientific paper

We searched for a variation with heliographic latitude of the solar limb effect by comparing the relative wavelengths of weak and strong Fraunhofer lines. The blue shifts associated with the limb effect appear 9%±5% larger in the polar radius vector than in an equatorial radius vector at cos θ = 0.5. This should perhaps be interpreted as an increase with latitude of either solar convection or of convective overshoot. Recent observations of poleward meridional flows of 30 m s-1 should be corrected for this limb effect variation. This correction increases this flow velocity to ∼70 m s-1. A search for a similar variation in plages and in network boundaries had negative results, the variation being +1%±5% and -1%±6% respectively.

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