Stokes imaging polarimetry using image restoration at the Swedish 1-m solar telescope
Abstract
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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 2008
- DOI:
- 10.1051/0004-6361:200809959
- arXiv:
- arXiv:0805.4296
- Bibcode:
- 2008A&A...489..429V
- Keywords:
-
- methods: observational;
- techniques: image processing;
- techniques: polarimetric;
- Sun: magnetic fields;
- sunspots;
- Sun: faculae;
- plages;
- Astrophysics
- E-Print:
- Accepted for publication in Astronomy &