On the fine structure of sunspot penumbrae. III. The vertical extension of penumbral filaments

Bibcode
2006A&A...450..383B
DOI
10.1051/0004-6361:20054378
Borrero, J. M.; Solanki, S. K.; Lagg, A.; Socas-Navarro, H.; Lites, B.
Bibliographical reference

Astronomy and Astrophysics, Volume 450, Issue 1, April IV 2006, pp.383-393

Advertised on:
4
2006
Journal
Astronomy and Astrophysics
Number of authors
5
IAC number of authors
0
Citations
48
Refereed citations
41
Description
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 Å. 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 μm 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.
Type
Refereed
Sunspots
Magnetic fields

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