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- W2964036644 abstract "Fabry-Perot interferometers have advantages over slit spectrographs because they allow fast narrow-band imaging and post-factum image reconstruction of spectropolarimetric data. Temperature, plasma velocity, and magnetic field maps can be derived from inversions of photospheric and chromospheric spectral lines, thus, advancing our understanding of the dynamic Sun and its magnetic fields at the smallest spatial scales. The GREGOR Fabry-Perot Interferometer (GFPI) is one of two firstlight instruments of the 1.5-meter GREGOR solar telescope, which is currently being commissioned at the Observatorio del Teide, Tenerife, Spain. 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 of 52×40 is sufficiently large to cover significant portions of active regions. The GFPI is a tuneable dual-etalon system in a collimated mounting. Equipped with a full-Stokes polarimeter, it records spectropolarimetric data with a spectral resolution of R ≈ 250,000 over the wavelength range from 530–860 nm. Large-format, high-cadence CCD detectors with powerful computer hardand software facilitate scanning of spectral lines in time spans corresponding to the evolution time-scale of solar features. We present the main characteristics of the GFPI including the latest developments in software, mechanical mounts, and optics." @default.
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- W2964036644 date "2011-11-24" @default.
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- W2964036644 title "The GREGOR Fabry-P'erot Interferometer - A New Instrument for High-Resolution Spectropolarimetric Solar Observations" @default.
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