Some comments on the limb shift of solar lines. Pt. 3

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 THETA = 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 approx. 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. (orig.)