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Stockholm IR Michelson


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Instrument/Model Description

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.

Reference for the instrument and data processing procedures

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

-Revised 22 June 2000 by Barbara Emery