Chromospheric polarimetry through multi-line observations of the 850 nm spectral region

Abstract

Future solar missions and ground-based telescopes aim to understand the magnetism of the solar chromosphere. We performed a supporting study in Quintero Noda et al. (2016) focused on the infrared Ca II 8542 A line and we concluded that is one of the best candidates because it is sensitive to a large range of atmospheric heights, from the photosphere to the middle chromosphere. However, we believe that it is worth to try improving the results produced by this line observing additional spectral lines. In that regard, we examined the neighbour solar spectrum looking for spectral lines that could increase the sensitivity to the atmospheric parameters. Interestingly, we discovered several photospheric lines that greatly improve the photospheric sensitivity to the magnetic field vector. Moreover, they are located close to a second chromospheric line that also belongs to the Ca II infrared triplet, i.e. the Ca II 8498 A line, and enhances the sensitivity to the atmospheric parameters at chromospheric layers. We conclude that the lines in the vicinity of the Ca II 8542 A line not only increase its sensitivity to the atmospheric parameters at all layers, but also they constitute an excellent spectral window for chromospheric polarimetry.

11 pages, 8 figures, 1 table

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• Spectropolarimetric observations of the Ca II 8498 A and 8542 A lines in the quiet Sun

Cited by in corpus (13)

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• Sunrise III: Overview of Observatory and Instruments
• Solar polarimetry through the K I lines at 770 nm
• Comparison of Two Coronal Magnetic Field Models for Reconstructing a Sigmoidal Solar Active Region With Coronal Loops
• Diagnostic capabilities of spectropolarimetric observations for understanding solar phenomena I. Zeeman-sensitive photospheric lines
• Height dependence of the penumbral fine-scale structure in the inner solar atmosphere
• Chromospheric polarimetry through multi-line observations of the 850 nm spectral region II: A magnetic flux tube scenario
• Chromospheric polarimetry through multi-line observations of the 850 nm spectral region III: Chromospheric jets driven by twisted magnetic fields
• The Sunrise Chromospheric Infrared Spectro-Polarimeter SCIP: an instrument for SUNRISE III
• Understanding the thermal and magnetic properties of a X-class flare in the low solar atmosphere
• Development of Fast and Precise Scan Mirror Mechanism for an Airborne Solar Telescope
• Effects of spatial resolution on inferences of atmospheric quantities from simulations
• On the (mis)interpretation of the scattering polarization signatures in the Ca II 8542 A line through spectral line inversions