Section headings and selected chapters: Foreword. Introduction. COSPAR International Reference Atmosphere grand mean, J J Barnett & S Chandra; Zonal mean temperature, pressure, zonal wind and geopotential height as functions of latitude, E L Fleming et al . Atmospheric Variability. Planetary and Gravity Waves . Climatological distribution of planetary waves in the middle atmosphere, J J Barnett & K Labitzk;. Seasonal and latitudinal variations of gravity waves, I Hirota. Tides. Atmospheric tides below 80km, J M Forbes & G V Grove;. Atmospheric tides between 80km and 120km, J M Forbes. Turbulence in the region 80-120km, W K Hocking. Comparison of Selected Data Sets with the New Reference Atmosphere. Solar mesosphere explorer temperature climatology of the mesosphere as compared to the CIRA model, R T Clancy & D W Rusch; Contribution to the new reference atmosphere from ground-based lidar, M L Chanin et al . Temperature and altitude of the polar mesopause in summer, U von Zahn. Southern hemisphere reference middle atmosphere, Yu P Koshelkov. Supplementary Data. Description and presentation of reference atmosphere radar winds (80-110km), A H Manson et al . Monthly mean tabulations, with standard deviations, of the zonal and meridional winds. Ozone reference models for the middle atmosphere, G M Keating et al . Appendix: Tables of the COSPAR middle atmosphere reference atmosphere. Author index.