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Proceedings Paper

Developments of the wideband spectropolarimeter of the Domeless Solar Telescope at Hida Observatory
Author(s): Tetsu Anan; Kiyoshi Ichimoto; Akihito Oi; Goichi Kimura; Yoshikazu Nakatani; Satoru Ueno
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Paper Abstract

We developed a new universal spectropolarimeter on the Domeless Solar Telescope at Hida Observatory to realize precise spectropolarimetric observations in a wide range of wavelength in visible and near infrared. The system aims to open a new window of plasma diagnostics by using Zeeman effect, Hanle effect, Stark effect, and impact polarization to measure the external magnetic field, electric field, and anisotropies in atomic excitation in solar atmosphere. The polarimeter consists of a 60 cm aperture vacuum telescope, a high dispersion vacuum spectrograph, polarization modulator and analyser composed of a continuously rotating waveplate whose retardation is constant in 400 - 1100 nm and Wallaston prisms located closely behind the focus of the telescope, and a fast and high sensitive CCD camera or a infrared camera. The duration for this polarimeter's achieving photometric accuracy of 10-3 is 30 - 60 s. Instrumental polarization of the telescope is calibrated by using a remotely controllable turret accommodating linear polarizer attached at the entrance window of the telescope to induce well known polarized light into the telescope. Thus a Mueller matrix model of the telescope is established to compensate the instrumental polarization included in observed data within the required accuracy.

Paper Details

Date Published: 24 September 2012
PDF: 12 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84461C (24 September 2012); doi: 10.1117/12.925639
Show Author Affiliations
Tetsu Anan, Kwasan and Hida Observatories (Japan)
Kiyoshi Ichimoto, Kwasan and Hida Observatories (Japan)
Akihito Oi, Kwasan and Hida Observatories (Japan)
Goichi Kimura, Kwasan and Hida Observatories (Japan)
Yoshikazu Nakatani, Kwasan and Hida Observatories (Japan)
Satoru Ueno, Kwasan and Hida Observatories (Japan)

Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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