The GREGOR Fabry-Perot interferometer: status report and prospects
The GREGOR Fabry-Perot interferometer: status report and prospects
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DOI：
10.1117/12.924834
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发表时间：
2012-07
期刊：
影响因子：
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通讯作者：
K. Puschmann;H. Balthasar;C. Beck;R. Louis;E. Popow;T. Seelemann;R. Volkmer;M. Woche;C. Denker
中科院分区：
文献类型：
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作者：
K. Puschmann;H. Balthasar;C. Beck;R. Louis;E. Popow;T. Seelemann;R. Volkmer;M. Woche;C. Denker
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.
