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Polarization Calibration of the <Emphasis Type="Italic">Chromospheric Lyman-Alpha SpectroPolarimeter</Emphasis> for a 0.1% Polarization Sensitivity in the VUV Range. Part II: In-Flight Calibration |
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| Authors: | G Giono R Ishikawa N Narukage R Kano Y Katsukawa M Kubo S Ishikawa T Bando H Hara Y Suematsu A Winebarger K Kobayashi F Auchère J Trujillo Bueno S Tsuneta T Shimizu T Sakao J Cirtain P Champey A Asensio Ramos J ?těpán L Belluzzi R Manso Sainz B De Pontieu K Ichimoto M Carlsson R Casini M Goto |
| Institution: | 1.National Astronomical Observatory of Japan,National Institutes of Natural Sciences,Mitaka,Japan;2.Institute of Space and Astronautical Science,Japan Aerospace Exploration Agency,Sagamihara,Japan;3.NASA Marshall Space Flight Center,Huntsville,USA;4.Institut d’Astrophysique Spatiale,CNRS/Université Paris-Sud 11,Orsay,France;5.Instituto de Astrofísica de Canarias,La Laguna,Spain;6.University of Alabama in Huntsville,Huntsville,USA;7.Astronomical Institute,Academy of Sciences of the Czech Republic,Ond?ejov,Czech Republic;8.Istituto Ricerche Solari Locarno,Locarno,Switzerland;9.Kiepenheuer-Institut für Sonnenphysik,Freiburg im Breisgau,Germany;10.Max-Planck-Institut für Sonnensystemforschung,G?ttingen,Germany;11.Lockheed Martin Solar and Astrophysics Laboratory,Palo Alto,USA;12.Hida Observatory,Kyoto University,Takayama,Japan;13.University of Oslo,Oslo,Norway;14.High Altitude Observatory,National Center for Atmospheric Research,Boulder,USA;15.National Institute for Fusion Science,National Institutes of Natural Sciences,Toki,Japan |
| Abstract: | The Chromospheric Lyman-Alpha SpectroPolarimeter is a sounding rocket instrument designed to measure for the first time the linear polarization of the hydrogen Lyman-\({\upalpha }\) line (121.6 nm). The instrument was successfully launched on 3 September 2015 and observations were conducted at the solar disc center and close to the limb during the five-minutes flight. In this article, the disc center observations are used to provide an in-flight calibration of the instrument spurious polarization. The derived in-flight spurious polarization is consistent with the spurious polarization levels determined during the pre-flight calibration and a statistical analysis of the polarization fluctuations from solar origin is conducted to ensure a 0.014% precision on the spurious polarization. The combination of the pre-flight and the in-flight polarization calibrations provides a complete picture of the instrument response matrix, and a proper error transfer method is used to confirm the achieved polarization accuracy. As a result, the unprecedented 0.1% polarization accuracy of the instrument in the vacuum ultraviolet is ensured by the polarization calibration. |
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