Stockholm IR Michelson

Contact Person: Patrick Espy sdlpespy@cc.usu.edu

The Stockholm, Sweden (59.5N, 18.2E) IR Michelson Interferometer (IRMI) scans in the near infrared between wavenumbers 6000 to 10,000 cm-1 (or in the range of 1000-1667 nm in wavelength), with a 4 cm-1 resolution (or 0.1% resolution, about 0.3 nm). The instrument is operated by Utah State University with support from Stockholm University.

The instrument measures the nightglow hydroxyl [OH]. The [OH] emission layer is centered near 87 km with a thickness of about 8 km. The center of the layer can vary between about 86 and 89 km, giving an error bar in the altitude of about +/6 km considering the thickness also. The rotational temperatures reflect the neutral temperatures in this altitude region. The measured parameters are the hydroxyl Meinel band rotational temperature in Kelvin and the hydroxyl Meinel integrated band radiance in kR (summary plots) and in log10(R) (data files).

For a 5 minute integration period, the temperature and radiance of the [OH] M(3,1) and M(4,2) bands may be derived at the 2-5% level (about 4-10 K and 1-4 kR) depending on the intensity level of the band.

A reference for the instrument and data processing procedures is:

Espy, P.J., R. Huppi and A. Manson, Large-scale, persistent
latitude structures in the mesospheric temperature during
ANLC-93, Geophys. Res. Lett, 22, 2801-2804, 1995.


Summary Plots for Stockholm IR Michelson

  • May 6-Jun 4, 1993 All data for this period
  • Jun 5-Jul 4, 1993 All data for this period
  • Jul 5-Aug 3, 1993 All data for this period
  • Aug 4-Sep 2, 1993 All data for this period
  • Sep 3-Oct 2, 1993 All data for this period
  • Oct 3-Nov 1, 1993 All data for this period
  • Nov 2-Dec 1, 1993 All data for this period
  • Dec 2-Dec 31, 1993 All data for this period
  • Jan 1-Jan 30, 1994 All data for this period
  • Jan 31-Mar 1, 1994 All data for this period
  • Mar 2-Mar 31, 1994 All data for this period
  • Apr 1-Apr 30, 1994 All data for this period
  • May 1-May 30, 1994 All data for this period
  • May 31-Jun 29, 1994 All data for this period
  • Jun 30-Jul 29, 1994 All data for this period
  • Jul 30-Aug 28, 1994 All data for this period
  • Aug 29-Sep 27, 1994 All data for this period
  • Sep 28-Oct 27, 1994 All data for this period
  • Oct 28-Nov 26, 1994 All data for this period
  • Nov 27-Dec 26, 1994 All data for this period
  • Dec 27-Dec 31, 1994 All data for this period


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    -Revised 22 June 2000 by emery@ucar.edu