Absolute shifts of Fe I and Fe II lines in solar active regions (disk center)

Details Absolute shifts of Fe I and Fe II lines in solar active regions (disk center) Absolute shifts of Fe I and Fe II lines in solar active regions (disk center)

2010-05-12

arxiv.org/abs/1005.2064v1

Kinematika i Fizika Nebesnykh Tel, 1997, Vol.13, no.5, p.75-86; Kinematics Phys. Celest. Bodies, 1997, Vol.13, no.5, p.65-74

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

12 pages, 4 figures, 2 tables. Published in Kinematika i Fizika Nebesnykh Tel (in Russian), Kinematics Phys. Celest. Bodies (i

Scientific paper

We estimated absolute shifts of Fe I and Fe II lines from Fourier-transform spectra observed in solar active regions. Weak Fe I lines and all Fe II lines tend to be red-shifted as compared to their positions in quiet areas, while strong Fe I lines, whose cores are formed above the level $\log \tau_5\approx-3$ (about 425 km), are relatively blue-shifted, the shift growing with decreasing lower excitation potential. We interpret the results through two-dimensional MHD models, which adequately reproduce red shifts of the lines formed deep in the photosphere. Blue shifts of the lines formed in higher layer do not gain substance from the models.

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