WAVE ACTIVITY OF THE MESOSPHERE IN THE PLANETARY WAVE RANGE ACCORDING TO OH (3-1) EMISSION OBSERVATIONS AT MAIMAGA AND TIKSI STATIONS FOR 2015–2020 Journal title: Solar-Terrestrial Physics Authors: Sivtseva V. I., Ammosov P. P., Gavrilieva G. A., Ammosova A. M., Koltovskoi I. I. Subject(s): Physics, Atmospheric Sciences