TY JOUR TI Critical level influence on spectra of secondary gravity waves in the middle and upper atmosphere KW acoustic-gravity waves KW spectrum KW secondary waves KW numerical simulation KW upper atmosphere KW middle atmosphere JO Solnechno-Zemnaya Fizika AU Gavrilov, N.M. AU Kshevetskii, S.P. AU Koval, A.V. AU Kurdyaeva, Y.A. PY 2026 IS 12 PB INFRA-M Academic Publishing LLC.