Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-12-14
Astrophys.J.659:829-847,2007
Astronomy and Astrophysics
Astrophysics
42 pages, 17 figures, accepted for publication in the Astrophysical Journal. Figures 1 and 9 are in JPG format
Scientific paper
10.1086/511951
We report on spectropolarimetric observations of a near-IR line of Mn I located at 15262.702 A whose intensity and polarization profiles are very sensitive to the presence of hyperfine structure. A theoretical investigation of the magnetic sensitivity of this line to the magnetic field uncovers several interesting properties. The most important one is that the presence of strong Paschen-Back perturbations due to the hyperfine structure produces an intensity line profile whose shape changes according to the absolute value of the magnetic field strength. A line ratio technique is developed from the intrinsic variations of the line profile. This line ratio technique is applied to spectropolarimetric observations of the quiet solar photosphere in order to explore the probability distribution function of the magnetic field strength. Particular attention is given to the quietest area of the observed field of view, which was encircled by an enhanced network region. A detailed theoretical investigation shows that the inferred distribution yields information on the average magnetic field strength and the spatial scale at which the magnetic field is organized. A first estimation gives ~250 G for the mean field strength and a tentative value of ~0.45" for the spatial scale at which the observed magnetic field is horizontally organized.
Ariste Lopez A.
Asensio Ramos Andrés
Collados Manuel
Martinez Gonzalez Jesus M.
Trujillo Bueno Javier
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