Spatial distributions of (a, b) the density and temperature perturbation ratios (ρ₁/ρ₀) and (T₁/T₀), as well as (c, d) the horizontal (u₁) and vertical velocity perturbations (w₁) for the selected wave mode. Panels a and c present the vertical profiles of the perturbations. Panels b and d show the horizontal distributions at selected altitudes of 100, 300, and 500 km. The horizontal wavelength (λ_x), the horizontal phase speed (v_p), and the period (τ) of the selected wave mode are 100 km, 15 m s⁻¹, and 1.85 h, respectively.