Simultaneous Observations with a Tunable Filter and the Echelle Spectrograph of the Vacuum Tower Telescope at Tenerife
The observing project described herein makes use of the great flexibility of the instrumentation of the Vacuum Tower Telescope at Tenerife. The most important characteristics of the telescope are described. The science observing programs were dedicated to the measurements of small scale magnetic structures and the velocity fields in both horizontal coordinates and at different heights in the solar atmosphere. Narrow band filtergrams in left and right handed circular polarized light with a field of view of about 120 arcseconds squared were recorded in order to construct longitudinal magnetograms while the spectrograph was equipped with a Stokes-V polarimeter for the measurement of Stokes-V profiles with high spectral resolution. Slit jaw reference pictures were taken in white light in order to locate the spectrograph slit in the magnetograms.
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