Solar polarimetry through the K I lines at 770 nm

Suematsu, Y.; Anan, T.; Ichimoto, K.; Kubo, M.; Orozco Suárez, D.; Ruiz Cobo, B.; Katsukawa, Y.; Shimizu, T.; Oba, T.; Carlsson, M.; Quintero Noda, C.; Uitenbroek, H.
Referencia bibliográfica

Monthly Notices of the Royal Astronomical Society, Volume 470, Issue 2, p.1453-1461

Fecha de publicación:
9
2017
Número de autores
12
Número de autores del IAC
1
Número de citas
13
Número de citas referidas
13
Descripción
We characterize the K I D1 & D2 lines in order to determine whether they could complement the 850 nm window, containing the Ca II infrared triplet lines and several Zeeman sensitive photospheric lines, that was studied previously. We investigate the effect of partial redistribution on the intensity profiles, their sensitivity to changes in different atmospheric parameters, and the spatial distribution of Zeeman polarization signals employing a realistic magnetohydrodynamic simulation. The results show that these lines form in the upper photosphere at around 500 km, and that they are sensitive to the line-of-sight velocity and magnetic field strength at heights where neither the photospheric lines nor the Ca II infrared lines are. However, at the same time, we found that their sensitivity to the temperature essentially comes from the photosphere. Then, we conclude that the K I lines provide a complement to the lines in the 850 nm window for the determination of atmospheric parameters in the upper photosphere, especially for the line-of-sight velocity and the magnetic field.
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