Abstract
<strong class="journal-contentHeaderColor">Abstract.</strong> The temporal variation of OH<sup>*</sup> emission and weighted rotational temperature has been studied for high-latitude summer conditions. Observations for 60°N latitude show OH weighted temperatures that always exceed 145 K even during periods of noctilucent clouds. Using a one-dimensional model the effects in excited OH concentration produced by changes in temperature, eddy diffusion, and water concentration have been analysed. We are forced to conclude that there remains a discrepancy between the OH temperatures predicted by the model and that obtained from OH<sup>*</sup> measurements. An increase in OH<sup>*</sup> concentration from June to the beginning of August, followed by a slow decrease during August has been obtained in agreement with the measurements. The 16-day modulation present in the measurements was simulated in a simple manner by varying the temperature in the mesopause region. This variation produces periodic modulations in both OH<sup>*</sup> concentration and weighted temperature of 16 days. The results show the temperature leading the OH<sup>*</sup> column concentration by three days. This phase shift is also present in the observations.
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