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Journal Article

Stokes imaging polarimetry using image restoration at the Swedish 1-m solar telescope


van Noort,  M.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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van Noort, M., & Rouppe van der Voort, L. H. M. (2008). Stokes imaging polarimetry using image restoration at the Swedish 1-m solar telescope. Astronomy and Astrophysics, 489, 429-440. doi:10.1051/0004-6361:200809959.

Cite as: https://hdl.handle.net/21.11116/0000-000D-8EA1-D
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.