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• W3105327994 endingPage "A126" @default.
• W3105327994 startingPage "A126" @default.
• W3105327994 abstract "Well-calibrated spectropolarimetry studies at resolutions of $R>$10,000 with signal-to-noise ratios (SNRs) better than 0.01% across individual line profiles, are becoming common with larger aperture telescopes. Spectropolarimetric studies require high SNR observations and are often limited by instrument systematic errors. As an example, fiber-fed spectropolarimeters combined with advanced line-combination algorithms can reach statistical error limits of 0.001% in measurements of spectral line profiles referenced to the continuum. Calibration of such observations is often required both for cross-talk and for continuum polarization. This is not straightforward since telescope cross-talk errors are rarely less than $sim$1%. In solar instruments like the Daniel K. Inouye Solar Telescope (DKIST), much more stringent calibration is required and the telescope optical design contains substantial intrinsic polarization artifacts. This paper describes some generally useful techniques we have applied to the HiVIS spectropolarimeter at the 3.7m AEOS telescope on Haleakala. HiVIS now yields accurate polarized spectral line profiles that are shot-noise limited to 0.01% SNR levels at our full spectral resolution of 10,000 at spectral sampling of $sim$100,000. We show line profiles with absolute spectropolarimetric calibration for cross-talk and continuum polarization in a system with polarization cross-talk levels of essentially 100%. In these data the continuum polarization can be recovered to one percent accuracy because of synchronized charge-shuffling model now working with our CCD detector. These techniques can be applied to other spectropolarimeters on other telescopes for both night and day-time applications such as DKIST, TMT and ELT which have folded non-axially symmetric foci." @default.
• W3105327994 created "2020-11-23" @default.
• W3105327994 creator A5010284890 @default.
• W3105327994 creator A5025898522 @default.
• W3105327994 creator A5081925400 @default.
• W3105327994 date "2015-06-01" @default.
• W3105327994 modified "2023-10-10" @default.
• W3105327994 title "Calibrating and stabilizing spectropolarimeters with charge shuffling and daytime sky measurements" @default.
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• W3105327994 doi "https://doi.org/10.1051/0004-6361/201322791" @default.
• W3105327994 hasPublicationYear "2015" @default.
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