CRISPRED: A data pipeline for the CRISP imaging spectropolarimeter
2015 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 573, A40Article in journal (Refereed) Published
The production of science-ready data from major solar telescopes requires expertise beyond that of the typical observer. This is a consequence of the increasing complexity of instruments and observing sequences, which require calibrations and corrections for instrumental and seeing effects that are not only difficult to measure, but are also coupled in ways that require careful analysis in the design of the correction procedures. Modern space-based telescopes have data-processing pipelines capable of routinely producing well-characterized data products. High resolution imaging spectropolarimeters at ground-based telescopes need similar data pipelines. We present new methods for flat-fielding spectropolarimetric data acquired with telecentric Fabry-Perot instruments and a new approach for accurate camera co-alignment for image restoration. We document a procedure that forms the basis of current state-of- the-art processing of data from the CRISP imaging spectropolarimeter at the Swedish 1 m Solar Telescope (SST). By collecting, implementing, and testing a suite of computer programs, we have defined a data reduction pipeline for this instrument. This pipeline, CRISPRED, streamlines the process of making science-ready data. It is implemented and operated in IDL, with time-consuming steps delegated to C. CRISPRED will also be the basis for the data pipeline of the forthcoming CHROMIS instrument.
Place, publisher, year, edition, pages
2015. Vol. 573, A40
techniques: imaging spectroscopy, techniques: image processing, instrumentation: high angular resolution, instrumentation: polarimeters
Other Physics Topics
IdentifiersURN: urn:nbn:se:uu:diva-247437DOI: 10.1051/0004-6361/201424319ISI: 000346901300039OAI: oai:DiVA.org:uu-247437DiVA: diva2:796818