Authors: Khaykin, A. Hauchecorne, J.-P. Pommereau, N. Mze, R. Wing, P. Keckhut, LATMOS-IPSL, UVSQ, Universites Sorbonne, CNRS, Guyancourt, France

We present various examples of application of active remote sensing for studies of dynamical processes in the middle atmosphere such as gravity waves and tides. The presented studies take advantage of the high capacities of GNSS radio occultation (RO) technique, providing high-resolution temperature profiles in the lower stratosphere with global geographical and full diurnal coverage. One study uses RO observations for exploring a non-migrating tide feature in the lower stratosphere induced by overshooting convection. Another study presents a global climatology of gravity wave (GW) potential energy and vertical wavelength in the stratosphere. Further, using a combination of GNSS-RO and ground-based temperature lidar we investigate the seasonal variation of GW activity at northern midlatitudes and identify its drivers. We also exploit wind and temperature profiling in the stratosphere and mesosphere using ground-based lidars at Observatoire de Haute Provence (OHP) for exploring dynamical processes in this altitude range of poor observational coverage.