Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-19
Astronomy and Astrophysics
Astrophysics
submitted to Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20054378
In this paper we study the fine structure of the penumbra as inferred from the uncombed model (flux tube embedded in a magnetic surrounding) when applied to penumbral spectropolarimetric data from the neutral iron lines at 6300 \AA. The inversion infers very similar radial dependences in the physical quantities (LOS velocity, magnetic field strength etc) as those obtained from the inversion of the Fe I 1.56 $\mu$m lines. In addition, the large Stokes $V$ area asymmetry exhibited by the visible lines helps to constrain the size of the penumbral flux tubes. As we demonstrate here, the uncombed model is able to reproduce the area asymmetry with striking accuracy, returning flux tubes as thick as 100-300 kilometers in the vertical direction, in good agreement with previous investigations.
Borrero Juan Manuel
Lagg Andreas
Lites Bruce
Socas-Navarro Hector
Solanki Sami K.
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