2007/08/21 by L. R. Bellot Rubio, S. Tsuneta, K. Ichimoto +9 · 2 citations
Physics and Astronomy · #Astrophysics and Star Formation Studies #Basso continuo #Flux (metallurgy) #Line (geometry) #Magnetic field #Magnetic flux #Photosphere #Solar and Space Plasma Dynamics #Spectral line #Stellar, planetary, and galactic studies #Sunspot #astro-ph
paper · pdf · doi:10.1086/522604
Accepted for publication in ApJ Letters. Use the Postscript version for high quality figures
arxiv created 2007/08/21 · openalex publication_date 2007/09/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present spectropolarimetric measurements of dark-cored penumbral filaments taken with Hinode at a resolution of 0.3''. Our observations demonstrate that dark-cored filaments are more prominent in polarized light than in continuum intensity. Far from disk center, the Stokes profiles emerging from these structures are very asymmetric and show evidence for magnetic fields of different inclinations along the line of sight, together with strong Evershed flows of at least 6-7 km s -1 . In sunspots closer to disk center, dark-cored penumbral filaments exhibit regular Stokes profiles with little asymmetries due to the vanishing line-of-sight component of the horizontal Evershed flow. An inversion of the observed spectra indicates that the magnetic field is weaker and more inclined in the dark cores as compared with the surrounding bright structures. This is compatible with the idea that dark-cored filaments are the manifestation of flux tubes carrying hot Evershed flows.