Abstract
Mesopause/lower thermosphere nocturnal temperatures have been deduced from spectrophotometric observations of the night airglow OH emissions at Longyearbyen, Svalbard (78°N), during four winter seasons (1980–1985). A monthly average temperature maximum of 223 K is found to occur in January with monthly averages of 206, 212,212 and 198 K respectively for November, December, February and March. A relatively low temperature in late December followed by a very warm mesopause in early January seems to be consistent for all four seasons and might be associated with changes in transmission of gravity waves to the upper mesosphere in connection with stratospheric and lower mesospheric circulation changes.
Published Version
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