This project investigated the coupling and dynamics of the mesosphere and lower thermosphere at arctic latitudes. A VHF meteor radar was deployed at Esrange (68N, 21E) to measure the and winds, waves and tides of the atmosphere at heights of ~ 80 - 100 km. The observations were used to determine the climatology and variability of the zonal and meridional winds, to measure the amplitudes, phases and variability of the 8-, 12- and 24-hour tides and to characterise the rich field of arctic planetary waves.