Polar OH-Airglow Temperature Variations in the 87/88 Winter

摘要

Measurements of OH-airglow spectra from Nord-lysstasjonen in Adventdalen, Svalbard (15°E, 78°N) from the period 1980-2000 have been done. The temperature at 87 km height was iterated by fitting synthetic spectra to the measured spectra using the vibrational band (6-2). As a first results of the analysis of the time series mesospheric coolings, strong diurnal and semidiurnal tides and a planetary wave have been found in the temperatures in the winter of 1987/1988. At the time of the extraordinarily early stratospheric warming in December a cooling of 30 K was observed. The strength of the diurnal and semidiurnal tides were 30 K and 15 K respectively. The observation of the planetary wave confirms various models that have shown that mesospheric planetary waves can be generated indirectly by planetary waves in the stratosphere, due to an uneven distribution of the propagation of orographic planetary waves into the mesosphere.