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Chromospheric polarimetry through multiline observations of the 850-nm spectral region
Stockholm University, Faculty of Science, Department of Astronomy.
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Number of Authors: 9
2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 464, no 4, 4534-4543 p.Article in journal (Refereed) Published
Abstract [en]

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. focused on the infrared Ca (II) 8542 angstrom line and we concluded that it 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 trying to improve the results produced by this line observing additional spectral lines. In that regard, we examined the neighbourhood solar spectrum looking for spectral lines which could increase the sensitivity to the atmospheric parameters. Interestingly, we discovered several photospheric lines which greatly improve the photospheric sensitivity to the magnetic field vector. Moreover, they are located close to a second chromospheric line which also belongs to the Ca (II) infrared triplet, i.e. the Ca (II) 8498 angstrom 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.

Place, publisher, year, edition, pages
2017. Vol. 464, no 4, 4534-4543 p.
Keyword [en]
techniques: polarimetric, Sun: chromosphere
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-142547DOI: 10.1093/mnras/stw2738ISI: 000393780500055OAI: oai:DiVA.org:su-142547DiVA: diva2:1093278
Available from: 2017-05-05 Created: 2017-05-05 Last updated: 2017-05-05Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • modern-language-association-8th-edition
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