Stokes imaging polarimetry using image restoration at the Swedish 1-m Solar Telescope

Abstract

Aims: We aim to achieve high spatial resolution as well as high polarimetric sensitivity, using an earth-based 1m-class solar telescope, for the study of magnetic fine structure on 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 as well as various potential sources of error in the results. Results: We obtained near diffraction limited images, with a noise level of approximately 10^(-3) I(cont). We confirm that dark-cores have a weaker magnetic field and at a lower inclination angle with respect to the solar surface than the edges of the penumbral filament. We show that the magnetic field strength in faculae-striations is significantly lower than in other nearby parts of the faculae.

Accepted for publication in Astronomy & Astrophysics, 12 pages, 11 figures

References in corpus (2)

• High Resolution Observations and Modeling of Dynamic Fibrils
• Vector spectropolarimetry of dark-cored penumbral filaments with Hinode

Cited by in corpus (20)

• CRISP Spectropolarimetric Imaging of Penumbral Fine Structure
• CRISPRED: A data pipeline for the CRISP imaging spectropolarimeter
• Heating signatures in the disk counterparts of solar spicules in IRIS observations
• Unresolved fine-scale structure in solar coronal loop-tops
• Inference of the chromospheric magnetic field orientation in the Ca II 8542 A line fibrils
• Internetwork chromospheric bright grains observed with IRIS
• Ellerman Bombs with Jets: Cause and Effect
• Lateral downflows in sunspot penumbral filaments and their temporal evolution
• On Fabry Pérot Etalon based Instruments. I. The Isotropic Case
• Design and Performance Analysis of a Highly Efficient Polychromatic Full-Stokes Polarization Modulator for the CRISP Imaging Spectrometer
• Estimating the longitudinal magnetic field in the chromosphere of quiet-Sun magnetic concentrations
• High flow speeds and transition-region like temperatures in the solar chromosphere during flux emergence
• Properties of Supersonic Evershed Downflows
• Improved reconstruction of solar magnetic fields from imaging spectropolarimetry through spatio-temporal regularisation
• Implications of spicule activity on coronal loop heating and catastrophic cooling
• On Fabry-Pérot Etalon-based Instruments. III. Instrument applications
• The dark side of penumbral microjets: Observations in Hα
• Accelerating Multiframe Blind Deconvolution via Deep Learning
• The making of robust and highly performing imaging spectropolarimeters for large solar telescopes
• Emergence of internetwork magnetic fields through the solar atmosphere