Abstract
Diurnal tides are forced in a global‐scale wave model using monthly mean tropospheric heating rates from the NCEP/NCAR Reanalysis Project. The heating rates give rise to a semiannual variation in the migrating (sun‐synchronous) tidal wind response near 95 km altitude with equinoctial maxima (∼50–70 ms−1) similar in magnitude to those derived from observational data. Nonmigrating (longitude‐dependent) tides with zonal wavenumbers s=−3 (eastward) to s=+5 (westward) are also generated. Many of these oscillations are characterized by wind and temperature amplitudes of order 20–30 ms−1 and 10–20 K in the lower thermosphere (100–130 km), and suggest that the tidal response in this regime varies considerably with longitude.
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