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Paper: Velocities in Magnetoconvective Structures inside Sunspot Umbrae
Volume: 454, The 3rd Hinode Science Meeting
Page: 217
Authors: Ortiz, A.; Bellot Rubio, L. R.; Rouppe van der Voort, L.
Abstract: We study the velocity field of umbral dots at a resolution of 0.″14. Our analysis is based on full Stokes spectropolarimetric measurements of a pore taken with the CRISP instrument at the Swedish 1-m Solar Telescope. We determine the flow velocity at different heights in the photosphere from a bisector analysis of the Fe I 630 nm lines. We find that most umbral dots are associated with strong upflows in deep photospheric layers. Some of them also show concentrated patches of downflows at their edges with velocities of up to 1000 m s-1 and enhanced net circular polarization signals. These results appear to validate numerical models of magnetoconvection in the presence of strong magnetic fields.
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