ON MODELING MIGRATING SOLAR TIDES

Recent updates and extensions to a steady-state two-dimensional linear ized model of global-scale atmospheric waves have facilitated improved calculations of the subset of those waves which are subharmonics of a solar day and propagate with the apparent motion of the sun. The mode l improvements are briefly described and some updated predictions of t he migrating solar diurnal component are highlighted. The latter repre sent the first numerical modeling effort to examine the seasonal varia bility of the migrating diurnal harmonic as it propagates into the mes osphere and lower thermosphere.