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  Solar Disk Center Shows Scattering Polarization in the Sr i 4607 Å Line

Zeuner, F., Manso Sainz, R., Feller, A., van Noort, M., Solanki, S. K., Iglesias, F. A., et al. (2020). Solar Disk Center Shows Scattering Polarization in the Sr i 4607 Å Line. The Astrophysical Journal Letters, 893(2): L44. doi:10.3847/2041-8213/ab86b8.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-479D-A Version Permalink: http://hdl.handle.net/21.11116/0000-0006-479E-9
Genre: Journal Article

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 Creators:
Zeuner, Franziska1, 2, Author              
Manso Sainz, R.1, Author              
Feller, Alex1, Author              
van Noort, Michiel1, Author              
Solanki, Sami K.1, Author              
Iglesias, Francisco A., Author
Reardon, Kevin, Author
Pillet, Valentín Martínez, Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              
2IMPRS for Solar System Science at the University of Göttingen, Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1832290              

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Free keywords: Spectropolarimetry ; Quiet Sun ; Solar photosphere ; Solar magnetic fields ; Polarimeters
 Abstract: Magnetic fields in turbulent, convective high-β plasma naturally develop highly tangled and complex topologies—the solar photosphere being the paradigmatic example. These fields are mostly undetectable by standard diagnostic techniques with finite spatio-temporal resolution due to cancellations of Zeeman polarization signals. Observations of resonance scattering polarization have been considered to overcome these problems. But up to now, observations of scattering polarization lack the necessary combination of high sensitivity and high spatial resolution in order to directly infer the turbulent magnetic structure at the resolution limit of solar telescopes. Here, we report the detection of clear spatial structuring of scattering polarization in a magnetically quiet solar region at disk center in the Sr i 4607 Å spectral line on granular scales, confirming theoretical expectations. We find that the linear polarization presents a strong spatial correlation with the local quadrupole of the radiation field. The result indicates that polarization survives the dynamic and turbulent magnetic environment of the middle photosphere and is thereby usable for spatially resolved Hanle observations. This is an important step toward the long-sought goal of directly observing turbulent solar magnetic fields at the resolution limit and investigating their spatial structure.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.3847/2041-8213/ab86b8
 Degree: -

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Title: The Astrophysical Journal Letters
  Other : Astrophys. J. Lett.
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 893 (2) Sequence Number: L44 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215