Solar polarimetry through the K I lines at 770 nm

DOI: 
10.1093/mnras/stx1344
Publication date: 
01/09/2017
Main author: 
Quintero Noda, C.
IAA authors: 
Orozco Suárez, D.
Authors: 
Quintero Noda, C.;Uitenbroek, H.;Katsukawa, Y.;Shimizu, T.;Oba, T.;Carlsson, M.;Orozco Suárez, D.;Ruiz Cobo, B.;Kubo, M.;Anan, T.;Ichimoto, K.;Suematsu, Y.
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Volume: 
470
Pages: 
1453-1461
Abstract: 

We characterize the K I D<SUB>1</SUB> & D<SUB>2</SUB> 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.

Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85023746841&doi=10.1093%2fmnras%2fstx1344&partnerID=40&md5=c6b76784a131a054c31bccc0a5fc25c3
ADS Bibcode: 
2017MNRAS.470.1453Q
Keywords: 
techniques: polarimetric;Sun: chromosphere