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IBIS-A: The IBIS data Archive

The IBIS data Archive (IBIS-A) contains data acquired with the Interferometric BIdimensional Spectropolarimeter (IBIS), which was operated at the Dunn Solar Telescope of the US National Solar Observatory from June 2003 to June 2019. The instrument provided series of high-resolution narrow-band spectropolarimetric imaging observations of the photosphere and chromosphere in the range 5800-8600 Å and co-temporal broad-band observations in the same range and field-of-view of the polarimetric data.
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A typical IBIS data set consists of measurements taken in sequence over multiple spectral lines (e.g. Fe I at 6302 Å and 6173 Å, and Ca II at 8542 Å); each line is sampled at several spectral positions (e.g. often between 10 and 30), each position at six polarimetric states (I+Q, I-Q, I+V, I-V, I+U and I-U). Therefore, a single scientific observation consists of many data (e.g. hundreds of image files, 1000 x 1000 pixel each, with variable cadence).IBIS was developed at the INAF Arcetri Astrophysical Observatory with contributions from the Universities of Florence and Rome “Tor Vergata”. It was installed at the focal plane of the Dunn Solar Telescope (DST) of the National Solar Observatory (NSO) in New Mexico (USA) in June 2003, on an optical bench fed by a high-order adaptive optics system. It was operated there by the NSO from 2005 to 2019 as a facility instrument. Following changes at DST, in 2019 the instrument was dismantled for refurbishing in light of its re-installation at a new telescope (Ermolli et al. 2020).

IBIS-A includes raw and calibrated observations, and science-ready data.
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The science-ready data comprise maps of the circular, linear, and net circular polarization, and of the magnetic and velocity fields derived for a significant fraction of the series available in the archive.

It furthermore contains links to observations complementary to the IBIS data, such as co-temporal high-resolution observations of the solar atmosphere available from the instruments onboard the Hinode and IRIS satellites, and full-disc multiband images from INAF solar telescopes.

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IBIS-A contributes to the Virtual Access Programme of the H2020 SOLARNET High-resolution Solar Physics Network project that aims at integrating the major European infrastructures in the field of high-resolution solar physics as a step towards the realisation of the 4m EST.

A sharp view of the Sun obtained with the IBIS at the NSO/Dunn Solar Telescope (New Mexico, USA).
The image shows remarkable details of the large sunspot seen in AR NOAA 12546 near the central meridian [S07W07].
Observer: Marco Stangalini (INAF) et al.
Image processing: Fabrizio Giorgi (INAF)
Wavelength: Fe I 617.3 nm line (continuum)
Date: 20 May 2016, 13:53 UT

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