SSTRED: Data- and metadata-processing pipeline for CHROMIS and CRISP

Abstract

Context: Data from ground-based, high-resolution solar telescopes can only be used for science with calibrations and processing, which requires detailed knowledge about the instrumentation. [...] Aims: We aim to provide observers with a user-friendly data pipeline for data from the Swedish 1-meter Solar Telescope (SST) that delivers science-ready data together with the metadata needed for proper interpretation and archiving. Methods: We briefly describe the [instrumentation]. We summarize the processing steps from raw data to science-ready data cubes in FITS files. We report calibrations and compensations for data imperfections in detail. Misalignment of \ion{Ca}{ii} data due to wavelength-dependent dispersion is identified, characterized, and compensated for. We describe intensity calibrations that remove or reduce the effects of filter transmission profiles as well as solar elevation changes. We present REDUX, a new version of the MOMFBD image restoration code, with multiple enhancements and new features. [...] We describe how image restoration is used [...]. The science-ready output is delivered in FITS files, with metadata compliant with the SOLARNET recommendations. Data cube coordinates are specified within the World Coordinate System (WCS). Cavity errors are specified as distortions of the WCS wavelength coordinate with an extension of existing WCS notation. We establish notation for specifying the reference system for Stokes vectors [...]. [CRISPEX] has been extended to accept SSTRED output [...]. Results: SSTRED is a mature data-processing pipeline for imaging instruments, developed and used for the SST/CHROMIS imaging spectrometer and the SST/CRISP spectropolarimeter. SSTRED delivers well-characterized, science-ready, archival-quality FITS files with well-defined metadata. The SSTRED code, as well as REDUX and CRISPEX, is freely available through git repositories.

Accepted for publication in A&A

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• Mapping the magnetic field of flare coronal loops
• Stokes imaging polarimetry using image restoration at the Swedish 1-m Solar Telescope
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• Spicules and downflows in the solar chromosphere
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Cited by in corpus (54)

• The European Solar Telescope
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• Spatio-temporal analysis of chromospheric heating in a plage region
• Ultra-high resolution observations of plasmoid-mediated magnetic reconnection in the deep solar atmosphere
• Center-to-limb variation of spectral lines and continua observed with SST/CRISP and SST/CHROMIS
• Properties of ubiquitous magnetic reconnection events in the lower solar atmosphere
• Active region chromospheric magnetic fields
• Solar oxygen abundance using SST/CRISP center-to-limb observations of the O I 7772 Å line
• The chromosphere underneath a Coronal Bright Point
• High-resolution observations of recurrent jets from an arch filament system
• Chromospheric swirls I. Automated detection in H$\alpha$ observations and their statistical properties
• Evidence of multithermal nature of spicular downflows. Impact on solar atmospheric heating
• Deciphering the solar coronal heating: Energizing small-scale loops through surface convection
• Spectral variations within solar flare ribbons
• Chromospheric observations and magnetic configuration of a supergranular structure
• Properties of shock waves in the quiet Sun chromosphere
• Inference of electric currents in the solar photosphere
• IBIS-A: The IBIS data Archive. High resolution observations of the solar photosphere and chromosphere with contextual data
• Small-scale magnetic flux emergence preceding a chain of energetic solar atmospheric events
• Synthesizing Sun-as-a-star flare spectra from high-resolution solar observations
• High flow speeds and transition-region like temperatures in the solar chromosphere during flux emergence
• Estimating the longitudinal magnetic field in the chromosphere of quiet-Sun magnetic concentrations
• Physical properties of a fan-shaped jet backlit by an X9.3 flare
• Improved reconstruction of solar magnetic fields from imaging spectropolarimetry through spatio-temporal regularisation
• Transition region response to Quiet Sun Ellerman Bombs
• COCOPLOT: COlor COllapsed PLOTting software : Using color to view 3D data as a 2D image
• Formation of H$\epsilon$ in the solar atmosphere
• Investigating the effect of solar ambient and data characteristics on Ca II K observations and line profile measurements
• Magnetic Topology of quiet-Sun Ellerman bombs and associated Ultraviolet brightenings
• A reconnection driven magnetic flux cancellation and a quiet Sun Ellerman bomb
• Fine details in solar flare ribbons: Statistical insights from observations with the Swedish 1-m Solar Telescope
• Radiative losses in the chromosphere during a C-class flare
• Coronal kink oscillations and photospheric driving: combining SolO/EUI and SST/CRISP high-resolution observations
• Accelerating Multiframe Blind Deconvolution via Deep Learning
• Small-scale dynamic phenomena associated with interacting fan-spine topologies: quiet-Sun Ellerman bombs, UV brightenings, and chromospheric inverted-Y-shaped jets
• The making of robust and highly performing imaging spectropolarimeters for large solar telescopes
• Stratification of canopy magnetic fields in a plage region. Constraints from a spatially-regularized weak-field approximation method
• High Resolution Observations of the Low Atmospheric Response to Small Coronal Heating Events in an Active Region Core
• Observations of umbral flashes in the resonant sunspot chromosphere
• Quiet Sun Ellerman bombs as a possible proxy for reconnection-driven spicules
• Transverse oscillations in 3D along Ca II K bright fibrils in the solar chromosphere
• Automatic detection of Ellerman bombs using Deep Learning
• Dark off-limb gap: manifestation of temperature minimum and dynamic nature of the chromosphere
• Solar Flux Atlases: The new HARPS-N Quiet Sun Benchmark and Ca II H & K Lines Continuum Normalisation
• torchmfbd: a flexible multi-object multi-frame blind deconvolution code
• Solar multi-object multi-frame blind deconvolution with a spatially variant convolution neural emulator
• Spectral Background-Subtracted Activity Maps
• On the Relationship between Solar Spicules and Propagating Coronal Disturbances: The Role of Shocks
• Active chromospheric fibril singularity: Coordinated observations from Solar Orbiter, SST, and IRIS
• The magnetic sensitivity of the Ca II H and K lines
• The Solar ALMA Science Archive (SALSA)
• Multi-frame blind deconvolution and phase diversity with statistical inclusion of uncorrected high-order modes
• Decay of a photospheric transient filament at the boundary of a pore and the chromospheric response