Computer Science
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...3e..88s&link_type=abstract
Solar Active Regions and 3D Magnetic Structure, 26th meeting of the IAU, Joint Discussion 3, 16-17 August, 2006, Prague, Czech R
Computer Science
Scientific paper
The fine-structure of the penumbra is an ideal target to study the effects of radiative magnetoconvection in inclined magnetic field, and to compare theoretical models with observed properties. I will present spectroscopic and spectro-polarimetric measurements, which are interpreted to reconstruct the thermal stratification and the complex topology of the magnetic field and the flow field. Such measurements reveal that the line-of-sight velocity and the magnetic field depend on depth in the atmosphere and exhibit gradients or discontinuities. The magnetic field is found to be uncombed, with an essentially horizontal component that carries a radial outward flow (Evershed flow), and a less inclined magnetic field component. I will report on the discovery of dark-cored bright filaments, and present spectroscopic measurements, which demonstrate that the dark cores are associated with the Evershed flow. The observational findings will be interpreted in the framework of theoretical models and ideas.
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