Abstract
Daily mean winds in the upper mesosphere regions above Tromsø (69°N, 19°E) and Svalbard (78°N, 16°E) are presented; these having been obtained from 6 years' operation of the middle frequency radar at Tromsø and almost 2 years' operation of the Svalbard meteor radar. The findings depart somewhat from the predictions of current modeling, particularly in that outflow from the pole occurs almost all year‐round. This picture is in accordance with a Ferrell cell circulation in summer but not in winter. Gravity‐wave drag, parameterized by the Rayleigh drag coefficient, is suggested as a likely cause of the widespread ageostrophic motion characterizing the winter dynamics.
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