Abstract
AbstractOne of the first post-focus instruments of the new solar telescope GREGOR will be a Fabry-Perot spectrometer, which is an upgrade of the Göttingen Fabry-Perot interferometer at the Vacuum Tower Telescope (VTT) on Tenerife. This spectrometer is equipped with a full-Stokes polarimeter. The modulation is performed with two ferroelectric liquid crystals, one acting nominally as quarter-wave plate, and the other as half-wave plate. A modified Savart plate serves as polarimetric beam splitter. With the present liquid crystals, the optimum wavelength range of this polarimeter is between 580 and 660 nm. The spectro-polarimeter will benefit from the capabilities of the new telescope GREGOR which will provide a spatial resolution of about 0″.1 (75 km on the solar surface). Thus we will be able to investigate small magnetic features, and we will study their development with high cadence.
Highlights
Instrumentation: polarimeters – instrumentation: spectrographs – Sun: magnetic fields
The new 1.5 m solar telescope GREGOR, which will become operational in the near future, will be able to resolve solar features with a size of 75 km
The Gottingen Fabry-Perot Interferometer (GFPI) originally described by Bendlin, Volkmer & Kneer (1992) is presently installed at the Vacuum Tower Telescope (VTT) on Tenerife where a long experience with FPIs exists
Summary
Instrumentation: polarimeters – instrumentation: spectrographs – Sun: magnetic fields The new 1.5 m solar telescope GREGOR (see Volkmer, von der Luhe, Kneer, et al, 2007), which will become operational in the near future, will be able to resolve solar features with a size of 75 km. An upgrade of the Gottingen Fabry-Perot Interferometer (GFPI) described by Puschmann, Kneer, Seelemann & Wittmann (2006) will be moved to GREGOR.
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