It is increasingly realized that the atmosphere-ionosphere system is controlled by upward propagating waves from below and by space weather effects from above. Wave effects encompass the effects of gravity waves, tides, and planetary-scale waves. Space weather includes geomagnetic and solar activity related processes and geomagnetic storms. This session aims to offer a platform for the studies of meteorological effects and space weather effects in the atmosphere-ionosphere system in order to facilitate interaction between the atmospheric and aeronomy community. Observational as well as modeling studies, focusing on dynamical, electrodynamical, thermal, geomagnetic and solar processes are encouraged for submission to this session. In general, recent results on atmospheric vertical coupling and latitudinal coupling, and in particular, sudden stratospheric warming effects in the atmosphere and coupling processes during equinoxes are of special relevance to the session. Contributions related to VarSITI's ROSMIC and SpeCIMEN scientific elements are also welcome.