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Title: Solar Spectral Lines with Special Polarization Properties for the Calibration of Instrument Polarization

Abstract

We investigate atomic transitions that have previously been identified as having zero polarization from the Zeeman effect. Our goal is to identify spectral lines that can be used for the calibration of instrumental polarization of large astronomical and solar telescopes, such as the Daniel K. Inouye Solar Telescope, which is currently under construction on Haleakala. We use a numerical model that takes into account the generation of scattering polarization and its modification by the presence of a magnetic field of arbitrary strength. We adopt values for the Landé factors from spectroscopic measurements or semi-empirical results, thus relaxing the common assumption of LS-coupling previously used in the literature. The mechanisms dominating the polarization of particular transitions are identified, and we summarize groups of various spectral lines useful for the calibration of spectropolarimetric instruments, classified according to their polarization properties.

Authors:
; ; ;  [1]
  1. High Altitude Observatory, National Center for Atmospheric Research 1, P.O. Box 3000, Boulder, CO 80307-3000 (United States)
Publication Date:
OSTI Identifier:
22679758
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 848; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ATMOSPHERES; CALIBRATION; COUPLING; MAGNETIC FIELDS; POLARIMETRY; POLARIZATION; SCATTERING; SPECTRA; SUN; TELESCOPES; ZEEMAN EFFECT

Citation Formats

Li, W., Casini, R., Alemán, T. del Pino, and Judge, P. G. Solar Spectral Lines with Special Polarization Properties for the Calibration of Instrument Polarization. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA8B0E.
Li, W., Casini, R., Alemán, T. del Pino, & Judge, P. G. Solar Spectral Lines with Special Polarization Properties for the Calibration of Instrument Polarization. United States. doi:10.3847/1538-4357/AA8B0E.
Li, W., Casini, R., Alemán, T. del Pino, and Judge, P. G. Fri . "Solar Spectral Lines with Special Polarization Properties for the Calibration of Instrument Polarization". United States. doi:10.3847/1538-4357/AA8B0E.
@article{osti_22679758,
title = {Solar Spectral Lines with Special Polarization Properties for the Calibration of Instrument Polarization},
author = {Li, W. and Casini, R. and Alemán, T. del Pino and Judge, P. G.},
abstractNote = {We investigate atomic transitions that have previously been identified as having zero polarization from the Zeeman effect. Our goal is to identify spectral lines that can be used for the calibration of instrumental polarization of large astronomical and solar telescopes, such as the Daniel K. Inouye Solar Telescope, which is currently under construction on Haleakala. We use a numerical model that takes into account the generation of scattering polarization and its modification by the presence of a magnetic field of arbitrary strength. We adopt values for the Landé factors from spectroscopic measurements or semi-empirical results, thus relaxing the common assumption of LS-coupling previously used in the literature. The mechanisms dominating the polarization of particular transitions are identified, and we summarize groups of various spectral lines useful for the calibration of spectropolarimetric instruments, classified according to their polarization properties.},
doi = {10.3847/1538-4357/AA8B0E},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 848,
place = {United States},
year = {2017},
month = {10}
}