Temperature gradients at mesopause heights inferred from OH nightglow data

Details Temperature gradients at mesopause heights inferred from OH nightglow data Temperature gradients at mesopause heights inferred from OH nightglow data

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9519061s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Nov. 1, 1990, p. 19061-19067. Research supported by the Aerospace Cor

Other

9

Hydroxyl Emission, Mesopause, Nightglow, Rotational Spectra, Temperature Gradients, Vibrational Spectra, Gravity Waves, Mesosphere

Scientific paper

A theoretical method is proposed to obtain thermal structural information about the mesopause, using multiple rotational lines from ground-based observations of a single vibration-rotation nightglow Meinel band of the electronic ground state of OH. The method determines the mean temperature of the emission region, the temperature difference across the region, and the magnitude of the temperature gradient for physically realistic assumptions about emission region thickness. It is applied to the OH (6,2) Meinel band spectra of the nightglow obtained during periods of low geomagnetic activity during January 1986 at Longyearbyen, Spitzbergen. The result of analyses indicate that, during the periods of observations, the emission region of the nightglow OH Meinel bands is significantly nonisothermal, with temperature gradient magnitudes of about 10 K/km (for an emission region thickness of 8 km). Such large temperature gradients are consistent with other independent measurements of a highly structured mesopause reported in the literature.

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