http://arxiv.org/abs/2112.12192
Based on calculations of the Stokes parameters for the Holweger-Mliller model atmosphere, we study sensitivity of the Fe I 525.02 nm line to some kinds of vertical and horizontal magnetic field inhomogeneity. A noticeable asymmetry is shown to appear in the V profile peaks when the vertical gradient is -0.4 mT/km, which is typical of some theoretical flux tube models. The asymmetry is most pronounced in a pure longitudinal magnetic field and at a low macroturbulent velocity. A similar effect is observed for the Q profile in nonlongitudinal fields as well. The Fe I 525.02 nm line is sensitive also to subtelescopic fields of mixed polarity like those observed by Stenflo in IR lines. We argue that the Wilson depression in small-scale flux tubes renders strong-field areas invisible at heliocentric angles greater than 60–65 degrees, since they are screened by surroundings with weaker magnetic fields.
V. Lozitskii and V. Sheminova
Fri, 24 Dec 21
44/58
Comments: 9 pages, 6 figures, published by Kinematics Phys. Celest. Bodies, 1995, Vol. 11, no. 4, p. 49-56
You must be logged in to post a comment.