GREGOR Fabry-Pérot interferometer: status report and prospects

Klaus G. Puschmann; Horst Balthasar; Christian Beck; Rohan E Louis; Emil Popow; Thomas Seelemann; Reiner Volkmer; Manfred Woche; Carsten Denker

doi:10.1117/12.924834

24 September 2012 The GREGOR Fabry-Perot interferometer: status report and prospects

Klaus G. Puschmann, Horst Balthasar, Christian Beck, Rohan E Louis, Emil Popow, Thomas Seelemann, Reiner Volkmer, Manfred Woche, Carsten Denker

Author Affiliations +

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 844679 (2012) https://doi.org/10.1117/12.924834
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The GREGOR Fabry-P´erot 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 allows fast narrow-band imaging and post-factum image restoration. The retrieved physical parameters will be a fundamental building block for understanding the dynamic Sun and its magnetic field at spatial scales down to 50 km on the solar surface. The GFPI is a tunable dual-etalon system in a collimated mounting. It is designed for spectropolarimetric observations over the wavelength range from 530–860 nm with a theoretical spectral resolution of R ≈ 250,000. The GFPI is equipped with a full-Stokes polarimeter. Large-format, high-cadence CCD detectors with powerful computer hard- and software enable the scanning of spectral lines in time spans equivalent to the evolution time of solar features. The field-of-view of 50′′×38′′ covers a significant fraction of the typical area of active regions. We present the main characteristics of the GFPI including advanced and automated calibration and observing procedures. We discuss improvements in the optical design of the instrument and show first observational results. Finally, we lay out first concrete ideas for the integration of a second FPI, the Blue Imaging Solar Spectrometer, which will explore the blue spectral region below 530 nm.

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Klaus G. Puschmann, Horst Balthasar, Christian Beck, Rohan E Louis, Emil Popow, Thomas Seelemann, Reiner Volkmer, Manfred Woche, and Carsten Denker "The GREGOR Fabry-Perot interferometer: status report and prospects", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844679 (24 September 2012); https://doi.org/10.1117/12.924834

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