High-resolution Spectropolarimetry with the Vacuum Tower Telescope at the Observatorio del Teide/Tenerife: History and Success of the Göttingen Programme

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The efforts of the Göttingen solar physics group on high spatial resolution and 2D spectroscopy started in 1986. First results were obtained with speckle broadband imaging (de Boer 1992) and with 2D spectroscopy by means of one Fabry-Perot etalon (FPI) and a Universal Birefringent Filter (UBF). 2D Stokes V polarimetry followed soon. The UBF was replaced by a 2nd FPI which allowed short exposures also in the narrow-band channel of the spectrometer. Thus 2D spectropolari- metry could be combined with speckle reconstruction. The ``Göttingen FPI'' has been upgraded in 2005 for high efficiency and in 2007 for full Stokes polarimetry and good spectral resolution. It has become a fast and versatile instrument that has been, and will be, operated sucessfully for many scientific programmes on the atmospheric dynamics of the Sun.

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