Polarization Calibration of the Chromospheric Lyman-Alpha SpectroPolarimeter for a 0.1% Polarization Sensitivity in the VUV Range. Part II: In-Flight Calibration
Additional information
Authors
Giono G.,
Ishikawa R.,
Narukage N.,
Kano R.,
Katsukawa Y.,
Kubo M.,
Ishikawa S.,
Bando T.,
Hara H.,
Suematsu Y.,
Winebarger A.,
Kobayashi K.,
Auchère F.,
Bueno J. T. .,
Tsuneta S.,
Shimizu T.,
Sakao T.,
Cirtain J.,
Champey P.,
Ramos A. A. .,
epán J. v. S. .,
Belluzzi L.,
Sainz R. M. .,
Pontieu B. D. .,
Ichimoto K.,
Carlsson M.,
Casini R.,
Goto M.
Type
Journal Article
Year
2017
Language
English
Abstract
The Chromospheric Lyman-Alpha SpectroPolarimeter is a sounding rocketinstrument 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.
Journal
Solar Physics
Volume
292
Start page number
57
Keywords
irsol-refereed-scientific-papers
