Spatial deconvolution of spectropolarimetric data: an application to quiet Sun magnetic elements

Abstract

Observations of the Sun from the Earth are always limited by the presence of the atmosphere, which strongly disturbs the images. A solution to this problem is to place the telescopes in space satellites, which produce observations without any (or limited) atmospheric aberrations. However, even though the images from space are not affected by atmospheric seeing, the optical properties of the instruments still limit the observations. In the case of diffraction limited observations, the PSF establishes the maximum allowed spatial resolution, defined as the distance between two nearby structures that can be properly distinguished. In addition, the shape of the PSF induce a dispersion of the light from different parts of the image, leading to what is commonly termed as stray light or dispersed light. This effect produces that light observed in a spatial location at the focal plane is a combination of the light emitted in the object at relatively distant spatial locations. We aim to correct the effect produced by the telescope's PSF using a deconvolution method, and we decided to apply the code on Hinode/SP quiet Sun observations. We analyze the validity of the deconvolution process with noisy data and we infer the physical properties of quiet Sun magnetic elements after the deconvolution process.

14 pages, 9 figures

References in corpus (21)

• The Solar Optical Telescope for the Hinode Mission: An Overview
• Sunrise: instrument, mission, data and first results
• The Imaging Magnetograph eXperiment (IMaX) for the Sunrise balloon-borne solar observatory
• The solar magnetic field
• An Open Source, Massively Parallel Code for Non-LTE Synthesis and Inversion of Spectral Lines and Zeeman-induced Stokes Profiles
• Small-scale solar magnetic fields
• Spatially coupled inversion of spectro-polarimetric image data I: Method and first results
• Fully resolved quiet-Sun magnetic flux tube observed with the Sunrise IMaX instrument
• Dynamics of Magnetic Flux Elements in the Solar Photosphere
• Quiet Sun magnetic fields at high spatial resolution
• On the validity of the 630 nm Fe I nm lines for the magnetometry of the internetwork quiet Sun
• Returning magnetic flux in sunspot penumbrae
• Properties of solar plage from a spatially coupled inversion of Hinode SP data
• Resolving the internal magnetic structure of the solar network
• Stray-light contamination and spatial deconvolution of slit-spectrograph observations
• Imaging Spectropolarimetry with IBIS II: on the fine structure of G-band bright features
• Temporal evolution of the Evershed flow in sunspots. I. Observational characterization of Evershed clouds
• Quiet Sun magnetic fields from space-borne observations: simulating Hinode's case
• Hinode observations reveal boundary layers of magnetic elements in the solar photosphere
• On the inversion of Stokes profiles with local stray-light contamination
• Influence of phase-diversity image reconstruction techniques on circular polarization asymmetries

Cited by in corpus (22)

• Enhancing SDO/HMI images using deep learning
• Stokes Inversion based on Convolutional Neural Networks
• Three-dimensional structure of a sunspot light bridge
• Deep probing of the photospheric sunspot penumbra: no evidence for magnetic field-free gaps
• Inferring Vector Magnetic Fields from Stokes Profiles of GST/NIRIS Using a Convolutional Neural Network
• A new MHD-assisted Stokes inversion technique
• On Fabry Pérot Etalon based Instruments. I. The Isotropic Case
• The small-scale structure of photospheric convection retrieved by a deconvolution technique applied to Hinode/SP data
• Height variation of magnetic field and plasma flows in isolated bright points
• Magnetic topology of the north solar pole
• Analysis of a spatially deconvolved solar pore
• Properties of the Umbral Filament Observed in Active Region NOAA 12529
• Penumbral decay observed in active region NOAA 12585
• Analysis of spatially deconvolved polar faculae
• Signatures of the impact of flare ejected plasma on the photosphere of a sunspot light-bridge
• Long-Term Evolution of Three Light Bridges Developed on the Same Sunspot
• Magnetic flux structuring of the quiet Sun internetwork. Center-to-limb analysis of solar-cycle variations
• Detection of emission in the Si i 1082.7 nm line core in sunspot umbrae
• The polarization signature of photospheric magnetic fields in 3D MHD simulations and observations at disk center
• Chromospheric plasma ejection above a pore
• Analysis of horizontal flows in the solar granulation
• Neural translation for Stokes inversion and synthesis