Polarimetric calibration of a spectropolarimeter instrument with high precision: Sunrise chromospheric infrared spectropolarimeter (SCIP) for the sunrise iii balloon telescope
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Le résumé fourni par la source
The Sunrise chromospheric infrared spectropolarimeter (SCIP) installed in the international balloon experiment sunrise iii will perform spectropolarimetric observations in the near-infrared band to measure solar photospheric and chromospheric magnetic fields simultaneously. The main components of SCIP for polarization measurements are a rotating wave plate, polarization beam splitters, and CMOS imaging sensors. In each of the sensors, SCIP records the orthogonal linearly polarized components of light. The polarization is later demodulated on-board. Each sensor covers one of the two distinct wavelength regions centered at 770 and 850 nm. To retrieve the proper circular polarization, the new parameter R , defined as the 45° phase shifted component of Stokes V in the modulation curve, is introduced. SCIP is aimed at achieving high polarization precision ( 1 σ < 3 × 10 − 4 of continuum intensity) to capture weak polarization signals in the chromosphere. The objectives of the polarization calibration test presented in this paper are to determine a response matrix of SCIP and to measure its repeatability and temperature dependence to achieve the required polarization precision. Tolerances of the response matrix elements were set after considering typical photospheric and chromospheric polarization signal levels. We constructed a feed optical system such that a telecentric beam can enter SCIP with the same f -number as the light distribution instrument of the sunrise iii telescope. A wire-grid linear polarizer and achromatic wave plate were placed before SCIP to produce the known polarization. The obtained response matrix was close to the values expected from the design. The wavelength and spatial variations, repeatability, and temperature dependence of the response matrix were confirmed to be smaller than tolerances.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Polarimetric calibration of a spectropolarimeter instrument with high precision: Sunrise chromospheric infrared spectropolarimeter (SCIP) for the sunrise iii balloon telescope
- Date Crossref
- 09/11/2022
- Éditeur
- Optica Publishing Group
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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National Astronomical Observatory of Japan pays non établi dans la noticeStructure de recherche
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National Solar Observatory pays non établi dans la noticeStructure de recherche
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Kyoto University Hida Observatory pays non établi dans la noticeUniversité ou école supérieure
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Instituto de Astrofísica de Canarias pays non établi dans la noticeStructure de recherche
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Instituto de Astrofísica de Andalucía pays non établi dans la noticeStructure de recherche
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Max Planck Institute for Solar System Research pays non établi dans la noticeStructure de recherche
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Max-Planck-Institut für Sonnensystemforschung pays non établi dans la noticeStructure de recherche
National Astronomical Observatory of Japan, National Solar Observatory et Hida Observatory — Kyoto University, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.