期刊
SOLAR PHYSICS
卷 289, 期 12, 页码 4727-4747出版社
SPRINGER
DOI: 10.1007/s11207-014-0583-x
关键词
Instrumentation and data management; Magnetic fields, chromosphere, transition region; Polarization; Spectrum, ultraviolet
资金
- Japan Society for the Promotion of Science (JSPS) [25220703]
- basic research program of the Institute of Space and Astronomical Science (ISAS)
- National Astronomical Observatory of Japan (NAOJ)
- JSPS KAKENHI [24340040, 23340052, 24740134]
- Grants-in-Aid for Scientific Research [24740134, 23340052] Funding Source: KAKEN
Spectro-polarimetric observations in the vacuum ultraviolet (VUV) range are currently the only means to measure magnetic fields in the upper chromosphere and transition region of the solar atmosphere. The Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP) aims to measure linear polarization at the hydrogen Lyman-alpha line (121.6 nm). This measurement requires a polarization sensitivity better than 0.1 %, which is unprecedented in the VUV range. We here present a strategy with which to realize such high-precision spectro-polarimetry. This involves the optimization of instrument design, testing of optical components, extensive analyses of polarization errors, polarization calibration of the instrument, and calibration with onboard data. We expect that this strategy will aid the development of other advanced high-precision polarimeters in the UV as well as in other wavelength ranges.
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