IBIS: Instrument Description and First Results

Physics – Optics

Scientific paper

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Scientific paper

In June 2003, the Inferometric Bidimensional Spectrometer (IBIS) was installed at the Dunn Solar Telescope at Sacramento Peak Observatory. This new instrument uses two Fabry-Perot interferometers to permit the detailed sampling (30-40 mÅ FWHM) of solar spectral lines over an 80 arcsecond diameter field of view in the range 5800-8600 Å. IBIS operates in combination with the NSO adaptive optics system, allowing it to achieve diffraction-limited images, while being able to scan through an entire spectral line in 5-10 seconds. The instrument design placed a premium on reducing parasitic spectral light and maintaining a stable and uniform spectral transmission profile across the field of view.
We present the operational characteristics of the instrument as determined from laboratory calibrations as well as tests performed during the initial observing runs with the instrument. We provide examples of the datasets obtained during these first observing runs and some preliminary results gleaned from these data. We also indicate some of the scientific programs for which this instrument is ideally suited.

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