A numerical study of the wind system in the middle thermosphere

Physics

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Scientific paper

Solar heating and cooling by molecular conduction create a large-amplitude, diurnal pressure oscillation in the middle and upper thermosphere. By a method described in a previous paper (Geisler, 1966), pressure gradients are calculated from a recent model of this region of the thermosphere. These are substituted into the equations of motion, which are then integrated over height and time to give a wind system. Selected features of this wind system are chosen for illustration. Particular attention is given to the variation with local time and with latitude of the meridional component of the wind, in view of its possible influence on the ionospheric F2-layer. This study attempts to set forth in detail the dynamical implications of a particular static model of the thermosphere. A further objective is to identify and discuss the effect of each of the terms appearing in the equations of motion. The extent to which present models of the thermosphere agree is such that the conclusion reached should not depend on which particular model is used to attain this objective.

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