where A = 10, v0 = 1ms−1, A × v0—amplitude of internal gravity wave, τ = 600 s—period of internal gravity
wave, t—Universal Time in s, n(O2)0 = 7.4 × 1019 m−3,n(N2)0 = 3.0 × 1020 m−3, n(O)0 = 2.4 × 1016 m−3, Tn0 =
188 K—background values of concentration of molecular
oxygen, molecular nitrogen, atomic oxygen and temperatures of neutral gas, accordingly, on the bottom boundary
of the thermosphere. The amplitude perturbations in the
neutral density and temperature were calculated according
to the relations of the IGWs linear theory found in Hines
(1960).