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Stokes imaging polarimetry using image restoration at the Swedish 1-m solar telescope
Stockholm University, Faculty of Science, Department of Astronomy.
2008 (English)In: Astronomy and Astrophysics, Vol. 489, no 1, 429-440 p.Article in journal (Refereed) Published
Abstract [en]

Aims. We aim to achieve both high spatial resolution and high polarimetric sensitivity, using an earth-based 1m-class solar telescope, for the study of magnetic fine structure on the surface of the Sun. Methods: We use a setup with 3 high-speed, low-noise cameras to construct datasets with interleaved polarimetric states, particularly suitable for Multi-Object Multi-Frame Blind Deconvolution image restorations. We discuss the polarimetric calibration routine and various potential sources of error in the results. Results: We obtained near diffraction limited images, which have a noise level of ≈ 10-3 I_cont. We confirm that dark cores have a weaker magnetic field and a lower inclination angle with respect to the solar surface than the edges of the penumbral filament. We demonstrate that the magnetic field strength in faculae-striations is significantly lower than in other nearby parts of the faculae.

Place, publisher, year, edition, pages
2008. Vol. 489, no 1, 429-440 p.
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-18315DOI: doi:10.1051/0004-6361:200809959OAI: oai:DiVA.org:su-18315DiVA: diva2:184838
Available from: 2009-01-25 Created: 2009-01-25 Last updated: 2011-01-10Bibliographically approved

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