EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 380/1 Article
Free access article

Issue A&A
Volume 380, Number 1, December II 2001
Page(s) L5 - L8
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20011505



A&A 380, L5-L8 (2001)
DOI: 10.1051/0004-6361:20011505

Zeeman-split opposite-polarity OH lines in sunspot spectra: Resolution of a puzzle

S. V. Berdyugina1 and S. K. Solanki2

1  Astronomy Division, PO Box 3000, 90014 University of Oulu, Finland
2  Max-Planck-Institut für Aeronomie, 37191 Katlenburg-Lindau, Germany

(Received 7 September 2001 / Accepted 10 October 2001 )

Abstract
We present the first synthetic Zeeman-split Stokes I and V profiles of OH lines. They explain the puzzling observations reported by Harvey (1985) of two pairs of lines from the infrared (2, 0) band with Stokes V profiles exhibiting opposite polarities. Our new perturbation calculations of the Zeeman effect in diatomic molecules, which allow states of any multiplicity to be treated, resolve the puzzle. They reveal that the unusual behaviour of these lines stems from the fact that the two pairs have effective Landé factors of similar magnitude, but of opposite signs.


Key words: Sun: sunspots -- molecules -- polarization

Offprint request: S. V. Berdyugina, Sveta.Berdyugina@oulu.fi




© ESO 2001


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.