Zero-Field Dichroism in the Solar Chromosphere

Details Zero-Field Dichroism in the Solar Chromosphere Zero-Field Dichroism in the Solar Chromosphere

2003-11-19

arxiv.org/abs/astro-ph/0311455v1

Phys.Rev.Lett. 91 (2003) 111102

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.91.111102

We explain the linear polarization of the Ca II infrared triplet observed close to the edge of the solar disk. In particular, we demonstrate that the physical origin of the enigmatic polarizations of the 866.2 nm and 854.2 nm lines lies in the existence of atomic polarization in their metastable lower levels, which produces differential absorption of polarization components (dichroism). To this end, we have solved the problem of the generation and transfer of polarized radiation by taking fully into account all the relevant optical pumping mechanisms in multilevel atomic models. We argue that `zero-field' dichroism may be of great diagnostic value in astrophysics.

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