  The IBIS data Archive (IBIS-A) stores data acquired with the Interferometric
BIdimensional Spectropolarimeter (IBIS), which was operated at the Dunn Solar
Telescope of the US National Solar Observatory from 2003 to 2019. The
instrument provided series of high-resolution narrowband spectropolarimetric
imaging observations of the photosphere and chromosphere in the range
5800$-$8600 \AA~ and co-temporal broadband observations in the same spectral
range and with the same field of view of the polarimetric data. We present the
data currently stored in IBIS-A, as well as the interface utilized to explore
such data and facilitate its scientific exploitation. To this purpose we also
describe the use of IBIS-A data in recent and undergoing studies relevant to
solar physics and space weather research. IBIS-A includes raw and calibrated
observations, as well as science-ready data. The latter 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. IBIS-A 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. IBIS-A
currently consists of 30 TB of data taken with IBIS during 28 observing
campaigns performed in 2008 and from 2012 to 2019 on 159 days. Metadata and
movies of each calibrated and science-ready series are also available to help
users evaluating observing conditions. IBIS-A represents a unique resource for
investigating the plasma processes in the solar atmosphere and the solar origin
of space weather events.
