Solar Convection and Oscillation Interactions

In this paper we investigate bisectors of solar photospheric lines. The bisectors reflect vertical velocity gradients over the height of line formation and therefore reveal important information about the dynamics in these layers. Their shape and shift is influenced by (a) convective motions, (b) oscillatory motions that can act differently at different photospheric heights. The bisectors are selected from different locations that show mainly a granular evolution or an intergranular evolution. Two selection criteria were applied: continuum intensity (enhanced for granular bisectors, reduced for intergranular bisectors), and full width at half maximum values (enhanced for intergranular bisectors). The results demonstrate how oscillatory motions influence the bisectors as a whole. In the example given a smaller amplitude of oscillations over intergranular areas is indicated.