A new instrument for high resolution two-dimensional solar spectroscopy

A two-dimensional spectrometer suitable for solar observations of high spatial, spectral, and temporal resolution was built and successfully tested with the German Vacuum Tower Telescope at the Observatorio del Teide/Tenerife. Using a universal birefringent filter and a Fabry-Perot interferometer (FPI), narrow-band (≤30 mA) filtergrams can be obtained. With this instrument, it is possible to scan through a Fraunhofer line at an appropriate number of wavelength settings within a few seconds. Here, fast scanning is accomplished by tuning only the FPI. The images are taken by two CCDs