The GREGOR Fabry-Pérot Interferometer

Abstract

The GREGOR Fabry-Pérot Interferometer (GFPI) is one of three first-light instruments of the German 1.5-meter GREGOR solar telescope at the Observatorio del Teide, Tenerife, Spain. The GFPI uses two tunable etalons in collimated mounting. Thanks to its large-format, high-cadence CCD detectors with sophisticated computer hard- and software it is capable of scanning spectral lines with a cadence that is sufficient to capture the dynamic evolution of the solar atmosphere. The field-of-view (FOV) of 50" x 38" is well suited for quiet Sun and sunspot observations. However, in the vector spectropolarimetric mode the FOV reduces to 25" x 38". The spectral coverage in the spectroscopic mode extends from 530-860 nm with a theoretical spectral resolution R of about 250,000, whereas in the vector spectropolarimetric mode the wavelength range is at present limited to 580-660 nm. The combination of fast narrow-band imaging and post-factum image restoration has the potential for discovery science concerning the dynamic Sun and its magnetic field at spatial scales down to about 50 km on the solar surface.

14 pages, 17 figures, 4 tables; pre-print of AN 333, p.880-893, 2012 (AN special issue to GREGOR)

References in corpus (14)

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• The Imaging Magnetograph eXperiment (IMaX) for the Sunrise balloon-borne solar observatory
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• Quiet Sun magnetic fields at high spatial resolution
• Center-to-Limb Variation of Solar Line Profiles as a Test of NLTE Line Formation Calculations
• Detection of vortex tubes in solar granulation from observations with Sunrise
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• Temporal evolution of the Evershed flow in sunspots. I. Observational characterization of Evershed clouds
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Cited by in corpus (35)

• The European Solar Telescope
• Waves in the lower solar atmosphere: the dawn of next-generation solar telescopes
• Measurements of Photospheric and Chromospheric Magnetic Fields
• Height variation of the cutoff frequency in a sunspot umbra
• GREGOR: Optics Redesign and Updates from 2018-2020
• Probing deep photospheric layers of the quiet Sun with high magnetic sensitivity
• Sunspot splitting triggering an eruptive flare
• A giant quiescent solar filament observed with high-resolution spectroscopy
• Flare Forecasting Algorithms Based on High-Gradient Polarity Inversion Lines in Active Regions
• Magnetic fields of opposite polarity in sunspot penumbrae
• Horizontal flow fields in and around a small active region-- The transition period between flux emergence and decay
• Thermodynamic fluctuations in solar photospheric three-dimensional convection simulations and observations
• High-resolution imaging and near-infrared spectroscopy of penumbral decay
• Can spicules be detected at disc centre in broad-band Ca II H filter imaging data ?
• Height variation of magnetic field and plasma flows in isolated bright points
• High-Cadence Imaging and Imaging Spectroscopy at the GREGOR Solar Telescope - A Collaborative Research Environment for High-Resolution Solar Physics
• Image Quality in High-resolution and High-cadence Solar Imaging
• Slipping reconnection in a solar flare observed in high resolution with the GREGOR solar telescope
• Spiral-shaped wavefronts in a sunspot umbra
• Fast Inversion of Solar Ca II Spectra in Non-Local Thermodynamic Equilibrium
• High-resolution imaging spectroscopy of two micro-pores and an arch filament system in a small emerging-flux region
• Spectroscopy at the solar limb: II. Are spicules heated to coronal temperatures ?
• Signatures of the impact of flare ejected plasma on the photosphere of a sunspot light-bridge
• New technique to measure the cavity defects of Fabry-Perot interferometers
• Ca II 8542 Å brightenings induced by a solar microflare
• Small-scale magnetic and velocity inhomogeneities in a sunspot light bridge
• Structure of the solar photosphere studied from the radiation hydrodynamics code ANTARES
• Designing wavelength sampling for Fabry-Pérot observations. Information-based spectral sampling
• Evidence of quiet Sun chromospheric activity related to an emerging small-scale magnetic loop
• High-resolution Observations of Halpha Spectra with a Subtractive Double Pass
• The making of robust and highly performing imaging spectropolarimeters for large solar telescopes
• Filigree in the Surroundings of Polar Crown and High-Latitude Filaments
• Multi-wavelength spectropolarimetric observations of AR13724 performed by GRIS
• Design of an adaptable Stokes polarimeter for exploring chromospheric magnetism
• An Unusual Velocity Field in a Sunspot Penumbra