Journal
SOLAR PHYSICS
Volume 292, Issue 4, Pages -Publisher
SPRINGER
DOI: 10.1007/s11207-017-1062-y
Keywords
Polarization calibration; Vacuum ultraviolet; Lyman-alpha; Solar chromosphere; CLASP
Categories
Funding
- ISAS/JAXA of NAOJ
- JSPS KAKENHI Grant [JP23340052, JP24740134, JP24340040, JP25220703]
- NASA Low Cost Access to Space [12-SHP 12/2-0283]
- Ministry of Economy and Competitiveness [AYA2010-18029]
- Centre National d'Etudes Spatiales (CNES)
- Grant Agency of the Czech Republic [16-16861S, RVO:67985815]
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The Chromospheric Lyman-Alpha SpectroPolarimeter is a sounding rocket instrument designed to measure for the first time the linear polarization of the hydrogen Lyman-alpha 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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