Affiliation:
1. National Astronomical Observatory of Japan
2. National Solar Observatory
3. Kyoto University
4. Instituto de Astrofísica de Canarias
5. Instituto de Astrofísica de Andalucía (IAA-CSIC)
6. Max-Planck-Institut für Sonnensystemforschung
Abstract
The Sunrise chromospheric
infrared spectropolarimeter
(SCIP) installed in the international balloon experiment
sunrise iii will
perform spectropolarimetric observations in the near-infrared band to
measure solar photospheric and chromospheric magnetic fields
simultaneously. The main components of SCIP for polarization
measurements are a rotating wave plate, polarization beam splitters,
and CMOS imaging sensors. In each of the sensors, SCIP records the
orthogonal linearly polarized components of light. The polarization is
later demodulated on-board. Each sensor covers one of the two distinct
wavelength regions centered at 770 and 850 nm. To retrieve the
proper circular polarization, the new parameter
R
, defined as the 45° phase shifted
component of Stokes
V
in the modulation curve, is
introduced. SCIP is aimed at achieving high polarization precision (
1
σ
<
3
×
10
−
4
of continuum intensity) to capture
weak polarization signals in the chromosphere. The objectives of the
polarization calibration test presented in this paper are to determine
a response matrix of SCIP and to measure its repeatability and
temperature dependence to achieve the required polarization precision.
Tolerances of the response matrix elements were set after considering
typical photospheric and chromospheric polarization signal levels. We
constructed a feed optical system such that a telecentric beam can
enter SCIP with the same
f
-number as the light distribution
instrument of the sunrise iii telescope. A wire-grid linear
polarizer and achromatic wave plate were placed before SCIP to produce
the known polarization. The obtained response matrix was close to the
values expected from the design. The wavelength and spatial
variations, repeatability, and temperature dependence of the response
matrix were confirmed to be smaller than tolerances.
Funder
Japan Society for the Promotion of
Science
Max Planck Foundation
National Aeronautics and Space
Administration
ISAS/JAXA Small Mission-of-Opportunity
Program
Spanish Research Agency
Centro de Excelencia Severo Ochoa
Program
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
3 articles.
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