M. Coffey and J. Hannigan (NCAR) – Bruker 120M (0.004 cm 1 resolution) installed at South Mountain in 1999, operating under autonomous control. Also capable of lunar observations. Instrument moved to Building 1971 (1km from previous location at same altitude) in Summer 2011. In May 2015 a new Bruker 125HR FTIR operating with new software control and new solar tracker was installed.
A. di Sarra, T. Di Iorio, and M. Cacciani (U. Rome, ENEA) – Winter-only measurements from September 1991 to 1996. Values currently too small to retrieve. Data are archived under previous PI (G. Fiocco).
A. di Sarra, T. Di Iorio, and M. Cacciani (U. Rome, ENEA) – Profiles from 25 – 75 km. Winter measurements from November 1993 to 1997. Year-round operation with daylight observations began in 2006. Did not operate in early 1998 to 2001, 2004 to 2005, and 2008. Data from 1993 to 1997 are archived under previous PI (G. Fiocco).
R. de Zafra (SUNY) – Two mm wave spectrometers (a rebuild of the original SUNY instrument and a new unit) have operated in a campaign mode. Measurements were conducted at Thule for the winters of 1992 and 1993. N2O measurements are also available at Thule for these winters.
R. de Zafra (SUNY), G. Muscari (INGV) – Winter only campaigns in 2002, 2003, and from 2009 onwards (except for 2013 and 2015). Vertical profiles from 25 to 75 km altitude with a ~30-minute time resolution. Data for 2002, 2003 is archived.
N. Jepsen (DMI) – Soundings made during campaigns. Database extends back to October 1991. Also measures humidity and wind profiles. Data through 2016 archived under original PI (P. Eriksen). Measurements ceased in late 2017.