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Polarization Calibration of the |
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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. Štěpán L. Belluzzi R. Manso Sainz B. De Pontieu K. Ichimoto M. Carlsson R. Casini M. Goto |
| Affiliation: | 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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