EDP Sciences
Free access
Volume 369, Number 2, April II 2001
Page 643
Section The Sun
DOI http://dx.doi.org/10.1051/0004-6361:20010033

A&A 369, 643- (2001)
DOI: 10.1051/0004-6361:20010033

Spectral signature of uncombed penumbral magnetic fields

J. Sánchez Almeida

Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain

(Received 11 December 2000 / Accepted 13 December 2000 )

The conservation of magnetic flux demands a magnetic field fine structure as small as 15 km to explain the net circular polarization observed in penumbrae (Sánchez Almeida 1998). A recent work by Martínez Pillet (2000) claims that modeling penumbrae as a collection of fluxtubes 100 km wide suffices. We identify several shortcomings of such modeling so that it is presently unclear whether it really contradicts the former conclusion.

Key words: Sun: magnetic fields -- sunspots

© ESO 2001