Abstract The UCL 3-dimensional model of the thermosphere has been modified by the addition of tidal forcing near the lower boundary (80 km), in order to simulate the effects of thermal tides propagating up from the lower atmosphere. Tidal forcing of the (2,2), (2,3) and (2,4) semidiurnal tidal modes and the (1,1) diurnal tidal mode has been introduced. The results of simulations with tidal forcing included are compared with observational data and with the results of simulations in which only in-situ tidal forcing mechanisms are present. The introduction of tidal forcing near the lower boundary is shown to improve the general fit of the model data to the observations of the winds and temperatures in the thermosphere. The vertical wavelengths and the heights of dissipation of different tidal modes are compared with the predictions of classical tidal theory. The coupling of semidiurnal and diurnal modes is discussed and the importance of different tidal dissipation processes is investigated.
Numerical simulations of propagating tides in the thermosphere
Advances in Space Research ; 12 , 6 ; 117-135
1991-01-01
19 pages
Article (Journal)
Electronic Resource
English
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