Instrument and data analysis challenges for imaging spectropolarimetry

Denker, C.

doi:10.1002/asna.201011393

Cited by 9 publications

(9 citation statements)

References 10 publications

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“…Two spectral lines can be observed sequentially while covering a FOV of 52 ×40 . A second Fabry-Pérot interferometer for the blue spectral region was proposed by Denker (2010), who addressed the opportunities but also the challenges for imaging spectropolarimetry brought forth by new large-format, high-cadence camera systems.…”

Section: Gregor Fabry-pérot Interferometer (Gfpi)mentioning

confidence: 99%

A retrospective of the GREGOR solar telescope in scientific literature

Denker¹,

Luehe²,

Feller³

et al. 2012

Astron Nachr

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In this review, we look back upon the literature, which had the GREGOR solar telescope project as its subject including science cases, telescope subsystems, and post-focus instruments. The articles date back to the year 2000, when the initial concepts for a new solar telescope on Tenerife were first presented at scientific meetings. This comprehensive bibliography contains literature until the year 2012, i.e., the final stages of commissioning and science verification. Taking stock of the various publications in peer-reviewed journals and conference proceedings also provides the "historical" context for the reference articles in this special issue of Astronomische Nachrichten/Astronomical Notes.Comment: 6 pages, 2 color figures, this is the pre-peer reviewed version of Denker et al. 2012, Astron. Nachr. 333, 81

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Section: Gregor Fabry-pérot Interferometer (Gfpi)mentioning

confidence: 99%

A retrospective of the GREGOR solar telescope in scientific literature

Denker¹,

Luehe²,

Feller³

et al. 2012

Astron Nachr

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“…This blue channel can also accommodate highcadence, large-format CCD cameras for imaging in the Ca II K line λ393.3 nm, the Fraunhofer G-band λ430.5 nm, or blue continuum λ450.8 nm. In the future, this channel will be used for the Blue Imaging Solar Spectropolarimeter (BLISS), 17 which extends imaging spectropolarimetry into the blue spectral region. Table 1 Table 2 Table 3 Table 4 Table 5 F1 TL1 P1 TL2 The core of the GFPI consists of two tunable Fabry-Pérot etalons with free apertures of 70 mm.…”

Section: Gfpi Optical Designmentioning

confidence: 99%

“…The huge data volume of terabytes per observing run requires a paradigm shift in ground-based solar observations away from principle investigator oriented observing campaigns towards service mode, event-triggered or long-term programs. 17 Furthermore, the complexity of data calibration and analysis as well as the computational demands will exceed the resources, which are available to a typical user, thus, necessitating streamlined data pipelines at data centers with well-characterized standard data products. Ensuring data quality is the driver for realtime data processing and for quick-look data products.…”

Section: Gfpi Operating Modesmentioning

confidence: 99%

The GREGOR Fabry-Perot interferometer: a new instrument for high-resolution solar observations

et al. 2010

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The GREGOR Fabry-Pérot Interferometer (GFPI) is one of the first-light instruments of the 1.5-meter GREGOR solar telescope currently being commissioned at Observatorio del Teide (OT), Tenerife, Spain. A spectral resolution of R ≈ 250, 000 over the wavelength range from 530-860 nm can be achieved using a tunable dual etalon system. A high spectral resolving power is needed to extract physical parameters (e.g., temperature, plasma velocity and the magnetic field vector) from inversions of photospheric and chromospheric spectral lines. The GFPI is outfitted with a polarimeter, which accurately measures the full Stokes vector. Precision polarimetry is facilitated by a calibration unit in the immediate vicinity of GREGOR's secondary focus. The GFPI operates close to the diffraction limit of GREGOR, thus providing access to fine structures as small as 60 km on the solar surface. The field-of-view (FOV) of 52 × 40 is sufficiently large to cover significant portions of active regions. Large-format, high-cadence CCD detectors are an integral part of the instrument to ensure that scans of spectral lines can be obtained in time spans corresponding to the evolution time scale of solar phenomena such as granulation, evolving magnetic fields or dynamic chromospheric features. Besides describing the technical features of the GFPI and providing a status report on commissioning the instrument, we will use two-dimensional spectropolarimetric data obtained with the Vacuum Tower Telescope (VTT) at OT to illustrate GFPI's science capabilities.

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“…At the GREGOR telescope, GRIS (Collados et al 2012) in the 'very fast spectroscopic mode' (VFSM) achieves a one-minute cadence comparable to that of imaging spectrometers (Denker 2010), covering an area of about 66 × 24 . Even higher cadences become possible by sacrificing spatial and spectral resolution.…”

Section: Introductionmentioning

confidence: 99%

Flows along arch filaments observed in the GRIS ‘very fast spectroscopic mode’

et al. 2016

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A new generation of solar instruments provides improved spectral, spatial, and temporal resolution, thus facilitating a better understanding of dynamic processes on the Sun. High-resolution observations often reveal multiple-component spectral line profiles, e.g., in the near-infrared He i 10830 Å triplet, which provides information about the chromospheric velocity and magnetic fine structure. We observed an emerging flux region, including two small pores and an arch filament system, on 2015 April 17 with the ‘very fast spectroscopic mode’ of the GREGOR Infrared Spectrograph (GRIS) situated at the 1.5-meter GREGOR solar telescope at Observatorio del Teide, Tenerife, Spain. We discuss this method of obtaining fast (one per minute) spectral scans of the solar surface and its potential to follow dynamic processes on the Sun. We demonstrate the performance of the ‘very fast spectroscopic mode’ by tracking chromospheric high-velocity features in the arch filament system.

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Instrument and data analysis challenges for imaging spectropolarimetry

Cited by 9 publications

References 10 publications

A retrospective of the GREGOR solar telescope in scientific literature

A retrospective of the GREGOR solar telescope in scientific literature

The GREGOR Fabry-Perot interferometer: a new instrument for high-resolution solar observations

Flows along arch filaments observed in the GRIS ‘very fast spectroscopic mode’

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