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