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Proceedings Paper

Calibration of the instrumental polarization of the Domeless Solar Telescope at the Hida Observatory
Author(s): Junko Kiyohara; Satoru Ueno; Reizaburo Kitai; Hiroki Kurokawa; Mitsugu Makita; Kiyoshi Ichimoto
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Paper Abstract

A new spectropolarimeter is developed at the Domeless Solar Telescope (DST) in Hida Observatory. It consists of a rotating waveplate, Wollaston prisms, and a high-dispersion spectrograph which is vertically installed at the focus of the DST. In order to realize a high-precision measurement, it is inevitable to compensate the instrumental polarization due to the DST. We observed the quiet region of the Sun, which is considered to be highly unpolarized, with and without a sheet linear polarizer or circular polarizer set at the entrance window of the telescope. The theoretical model which represents the total instrumental polarization of the DST with some characteristic parameters was calculated and compared with the observation. The model that two flat mirrors have different properties can explain the observation in 0.5% accuracy for the unpolarized light, and in 7% for the polarized light.

Paper Details

Date Published: 30 September 2004
PDF: 8 pages
Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); doi: 10.1117/12.551222
Show Author Affiliations
Junko Kiyohara, Kwasan Observatory (Japan)
Satoru Ueno, Hida Observatory (Japan)
Reizaburo Kitai, Hida Observatory (Japan)
Hiroki Kurokawa, Kwasan Observatory (Japan)
Mitsugu Makita, Kwasan Observatory (Japan)
Kiyoshi Ichimoto, National Astronomical Observatory of Japan (Japan)

Published in SPIE Proceedings Vol. 5492:
Ground-based Instrumentation for Astronomy
Alan F. M. Moorwood; Masanori Iye, Editor(s)

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