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 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.
@article{arxiv.1210.2921,
title = {The GREGOR Fabry-P\'erot Interferometer},
author = {K. G. Puschmann and C. Denker and F. Kneer and N. Al Erdogan and H. Balthasar and S. M. Bauer and C. Beck and N. Bello González and M. Collados and T. Hahn and J. Hirzberger and A. Hofmann and R. E. Louis and H. Nicklas and O. Okunev and V. Martínez Pillet and E. Popow and T. Seelemann and R. Volkmer and A. D. Wittmann and M. Woche},
journal= {arXiv preprint arXiv:1210.2921},
year = {2012}
}
Comments
14 pages, 17 figures, 4 tables; pre-print of AN 333, p.880-893, 2012 (AN special issue to GREGOR)