Polarimetric calibration of the Tunable Magnetograph for the Sunrise III mission

Polarimetric calibration of the Tunable Magnetograph for the Sunrise III mission | Research Square Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Polarimetric calibration of the Tunable Magnetograph for the Sunrise III mission Antonio Campos-Jara, Alberto Álvarez-Herrero, Pilar García-Parejo, and 7 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8979318/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 04 Aug, 2026 Read the published version in Solar Physics → Version 1 posted 7 You are reading this latest preprint version Abstract The Tunable Magnetograph (TuMag) onboard Sunrise III is an imaging spectropolarimeter designed to ultimately infer the solar vector magnetic field and line-of-sight velocity. It includes Liquid Crystal Variable Retarders for polarimetric modulation and hence requires accurate polarimetric calibration to achieve its scientific goals. This work reports on the pre-flight calibration carried out on ground at different stages during the TuMag assembly, integration and verification phase. It includes the polarization modulator characterization, the verifications at instrument level, and, finally, the full system calibration after its integration in SUNRISE within the Post-Focus Instrumentation platform.The calibration includes determining the field-dependent demodulation matrices (pixel-by-pixel calibration) and evaluating polarimetric efficiencies, ensuring compliance with the mission sensitivity requirements. The results of this work provide the calibrated demodulation matrices that will be used for the scientific exploitation of the mission data. Instrumentation and Data Management Polarization Optical Magnetic fields Photosphere Velocity Fields Photosphere Spectrum Visible Full Text Additional Declarations No competing interests reported. Supplementary Files ESMfigures.zip Cite Share Download PDF Status: Published Journal Publication published 04 Aug, 2026 Read the published version in Solar Physics → Version 1 posted Editorial decision: Revision requested 18 May, 2026 Reviews received at journal 15 May, 2026 Reviewers agreed at journal 08 Apr, 2026 Reviewers invited by journal 05 Mar, 2026 Editor assigned by journal 27 Feb, 2026 Submission checks completed at journal 27 Feb, 2026 First submitted to journal 26 Feb, 2026 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information

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