The Hanle and Zeeman Polarization Signals of the Solar Ca II 8542 angstromLine

0463132 - ASÚ 2017 RIV US eng J - Journal Article
Štěpán, Jiří - Trujillo Bueno, J.
The Hanle and Zeeman Polarization Signals of the Solar Ca II 8542 angstromLine.
Astrophysical Journal Letters. Roč. 826, č. 1 (2016), L10/1-L10/6. ISSN 2041-8205. E-ISSN 2041-8213
R&D Projects: GA ČR(CZ) GA16-16861S
Grant - others:COST Action(XE) MP1104
Institutional support: RVO:67985815
Keywords : line profiles * polarization * radiative transfer
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 5.522, year: 2016

We highlight the main results of a three-dimensional (3D) multilevel radiative transfer investigation about the solar disk-center polarization of the Ca-II 8542 angstrom line. First, through the use of a 3D model of the solar atmosphere, we investigate the linear polarization that occurs due to the atomic level polarization produced by the absorption and scattering of anisotropic radiation, taking into account the symmetry-breaking effects caused by its thermal, dynamic, and magnetic structure. Second, we study the contribution of the Zeeman effect to the linear and circular polarization. Finally, we show examples of the Stokes profiles produced by the joint action of the atomic level polarization and the Hanle and Zeeman effects. We find that the Zeeman effect tends to dominate the linear polarization signals only in the localized patches of opposite magnetic polarity, where the magnetic field is relatively strong and slightly inclined; outside such very localized patches, the linear polarization is often dominated by the contribution of atomic level polarization.
Permanent Link: http://hdl.handle.net/11104/0262405