Letter to the Editor
Successful spectral synthesis of Zeeman-split molecular bands in sunspot spectra
S.V. Berdyugina 1,
C. Frutiger 2,
S.K. Solanki 3 and
W. Livingstone 4
Received 26 October 2000 / Accepted 20 November 2000
We present the first spectral synthesis of Zeeman-split Stokes profiles of the MgH - green system and TiO -system. The calculations involve different regimes of the molecular Zeeman effect, up to the complete Paschen-Back effect for individual lines. The synthetic spectra are compared with observations of Stokes I and V in sunspot umbrae. We find that although the Stokes I spectra are reasonably reproduced, some lines are obviously still missing from the employed line lists. The Stokes V spectra turn out to be much cleaner since the missing lines do not appear to be Zeeman-split. We thus provide the first good fit to Zeeman-split molecular lines, including profiles with unconventional Stokes V shapes, determined by the Paschen-Back effect.
Key words: Sun: magnetic fields Sun: sunspots line: formation polarization molecular processes
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© European Southern Observatory (ESO) 2000
Online publication: January 29, 2001