TY JOUR TI Comparison between seasonal variations in tidal and internal gravity wave activity as derived from observations at Maimaga and Tiksi KW high-latitude mesopause KW hydroxyl emission KW internal gravity waves KW tidal waves JO Solar-Terrestrial Physics AU Sivtseva, V.I. AU Ammosov, P.P. AU Gavrilieva, G.A. AU Ammosova, A.M. AU Koltovskoi, I.I. PY 2018 IS 4 PB INFRA-M Academic Publishing LLC.