TY JOUR TI Modeling of the effect of internal gravity waves on upper atmospheric conditions during sudden stratospheric warming KW Internal gravity waves KW Sudden stratospheric warmings KW Modeling JO Solar-Terrestrial Physics AU Vasilyev, P.A. AU Karpov, I.V. AU Kshevetskii, S.P. PY 2016 IS 2 PB INFRA-M Academic Publishing LLC.