&lt;title&gt;Advanced Stokes polarimeter: a new instrument for solar magnetic field research&lt;/title&gt;

Elmore, D.; Lites, B. W.; Tomczyk, Steven; Skumanich, A.; Dunn, R. B.; Schuenke, Jeffrey A.; Streander, K. V.; Leach, Terry W.; Chambellan, C. W.; Hull, Howard K.; Lacey, L.

doi:10.1117/12.138795

Cited by 141 publications

(46 citation statements)

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“…The demodulation scheme is shown graphically and in table form for the eight-exposure scheme shown in Figure 22 of . This same demodula- tion scheme was used for the ASP (Elmore et al, 1992). The size of the smart memory for the SP is eight Mbytes to allow for double-buffering of the data.…”

Section: De-modulation Electronics and On-board Data Processingmentioning

confidence: 99%

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The Hinode Spectro-Polarimeter

et al. 2013

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The joint Japan/US/UK Hinode mission includes the first large-aperture visiblelight solar telescope flown in space. One component of the Focal Plane Package of that telescope is a precision spectro-polarimeter designed to measure full Stokes spectra with the intent of using those spectra to infer the magnetic-field vector at high precision in the solar photosphere. This article describes the characteristics of the flight hardware of the Hinode Spectro-Polarimeter, and summarizes its in-flight performance.

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Section: De-modulation Electronics and On-board Data Processingmentioning

confidence: 99%

“…The Hinode/SP has significant heritage from the Advanced Stokes Polarimeter (ASP: Elmore et al, 1992). Unlike ASP, the SP operates only in a fixed band of wavelengths centered on the Zeeman-sensitive Fe I lines at 6302 Å.…”

Section: Overview Of the Spectro-polarimetermentioning

confidence: 99%

The Hinode Spectro-Polarimeter

et al. 2013

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“…This normalized double difference method is quite common and can easily be compared with other difference and ratio methods (Harrington & Kuhn 2008;Bagnulo et al 2009Bagnulo et al , 2012Patat & Romaniello 2006;Elmore et al 1992). With 4 Hz modulation and a single-exposure per polarization spectrum, stable variations with time are seen.…”

Section: Figmentioning

confidence: 98%

“…Even axially symmetric telescope beams require calibration of instrumental polarization from the instrument optics and nonuniformities in coatings (Hough et al 2006;Bailey et al 2010Bailey et al , 2008Wiktorowicz & Matthews 2008) In the solar community, several instruments have included very fast polarimetric modulation to overcome many of these common instrument issues to achieve 0.001% differential precision polarimetry. Modulators include liquid crystals (LCs), piezo-elastic modulators (PEMs), rapidly rotating components and other techniques (Gandorfer 1999;Elmore et al 1992;Skumanich et al 1997;Gandorfer et al 2004;Lin et al 2004). Modulation can be chromatically balanced, tuned or optimized for various observing cases (Povel 1995;Gisler et al 2003;Tomczyk et al 2010;de Wijn et al 2010de Wijn et al , 2011Snik et al 2009;López Ariste & Semel 2011;Nagaraju et al 2007).…”

Section: Spectropolarimetric Instruments Errors and Suppression Tecmentioning

confidence: 99%

Calibrating and stabilizing spectropolarimeters with charge shuffling and daytime sky measurements

Harrington

Kuhn

Nevin

2015

A&A

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Well-calibrated spectropolarimetry studies at resolutions of R > 10 000 with signal-to-noise ratios (S/Ns) better than 0.01% across individual line profiles, are becoming common with larger aperture telescopes. Spectropolarimetric studies require high S/N 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 ∼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 3.7 m AEOS Telescope on Haleakala. HiVIS now yields accurate polarized spectral line profiles that are shot-noise limited to 0.01% S/N levels at our full spectral resolution of 10 000 at spectral sampling of ∼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 daytime applications such as DKIST, TMT, and ELT which have folded non-axially symmetric foci.

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“…The system is described in detail by Elmore et al (1992). Table I lists the typical operating parameters for ASP.…”

Section: The Instrumentmentioning

confidence: 99%

Early Results from the HAO/NSO Advanced Stokes Polarimeter

Lites

Elmore

Tomczyk

et al. 1993

International Astronomical Union Colloquium

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The Advanced Stokes Polarimeter is a new instrument dedicated to quantitative measurement of vector magnetic fields in lines formed at several heights in the solar atmosphere at high angular resolution. We present results for a small, symmetric sunspot observed under good seeing conditions near disk center on 25 March 1992. The narrow penumbral "spines" of more vertical field reported by Degenhardt and Wiehr (1991) and Title et al. (1992) are clearly seen in these observations. These spines are characterized by higher field strength than the surrounding penumbra. The inferred field azimuth indicates that these spines flare out with height, as would be expected of stronger field intrusions within the background penumbral field. The observations indicate the penumbral field "canopy" extends well beyond the outer edge of the penumbra. Outside of the sunspot, the small flux elements of mixed polarity are nearly vertical in orientation.

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<title>Advanced Stokes polarimeter: a new instrument for solar magnetic field research</title>

Cited by 141 publications

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The Hinode Spectro-Polarimeter

The Hinode Spectro-Polarimeter

Calibrating and stabilizing spectropolarimeters with charge shuffling and daytime sky measurements

Early Results from the HAO/NSO Advanced Stokes Polarimeter

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