Bibcode
Viticchié, B.; Sánchez-Almeida, J.; Landi Degl'Innocenti, E.; Berrilli, F.
Bibliographical reference
Solar Polarization 5: In Honor of Jan Stenflo ASP Conference Series, Vol. 405, proceedings of the conference held 17-21 September, 2007 at Centro Stefano Franscini--Monte Veritá, Ascona, Switzerland. Edited by Svetlana V. Berdyugina, K. N. Nagendra, and Renzo Ramelli. San Francisco: Astronomical Society of the Pacific, 2009., p.319
Advertised on:
6
2009
Citations
0
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0
Description
We present the first synthesis of Mn I lines in realistic
multi-component magnetized quiet Sun atmospheres, including variation of
magnetic field strength, magnetic field direction, plasma velocity, and
coupling between magnetic field and thermodynamics. All synthesized Mn I
lines weaken for strong magnetic fields. A detailed analysis of the Mn I
λ5538 line shows that the Weak Field Approximation (WFA) breaks
down at 400~G, and that kG magnetic fields produce Stokes V profiles
with amplitudes up to two orders of magnitude smaller than those
predicted by the WFA. Consequently, the polarization emerging from an
atmosphere in which weak (hG) and strong (kG) fields coexist is biased
towards the hG field polarization. When including velocity gradients,
profiles showing important asymmetries are produced, and these profiles
cannot be obtained using single-component magnetized model atmospheres.
We synthesize Mn I lines presenting very different hyperfine structure
(HFS) patterns, and all of them reproduce the observed Stokes I profiles
in a really satisfactory way.