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Inference of the chromospheric magnetic field orientation in the Ca II 8542 angstrom line fibrils
Stockholm University, Faculty of Science, Department of Astronomy.
Number of Authors: 4
2017 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 599, A133Article in journal (Refereed) Published
Abstract [en]

Context. Solar chromospheric fibrils, as observed in the core of strong chromospheric spectral lines, extend from photospheric field concentrations suggesting that they trace magnetic field lines. These images have been historically used as proxies of magnetic fields for many purposes.

Aims. Use statistical analysis to test whether the association between fibrils and magnetic field lines is justified.

Methods. We use a Bayesian hierarchical model to analyze several tens of thousands of pixels in spectro- polarimetric chromospheric images of penumbrae and chromospheric fibrils. We compare the alignment between the field azimuth inferred from the linear polarization signals through the transverse Zeeman effect and the direction of the fibrils in the image.

Results. We conclude that, in the analyzed fields of view, fibrils are often well aligned with the magnetic field azimuth. Despite this alignment, the analysis also shows that there is a non-negligible dispersion. In penumbral filaments, we find a dispersion with a standard deviation of similar to 16 degrees, while this dispersion goes up to similar to 34 degrees in less magnetized regions.

Place, publisher, year, edition, pages
2017. Vol. 599, A133
Keyword [en]
Sun: chromosphere, Sun: magnetic fields, sunspots, polarization
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-148919DOI: 10.1051/0004-6361/201629755ISI: 000413691400010OAI: oai:DiVA.org:su-148919DiVA: diva2:1156943
Available from: 2017-11-14 Created: 2017-11-14 Last updated: 2017-11-14Bibliographically approved

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