Antarctic Quasi-10 Day Wave Activity Prior to the 2019 Southern sudden stratospheric warming

An unusual sudden stratospheric warming (SSW) occurred in the Southern hemisphere in September 2019. Satellite observations show a burst of eastward-propagating quasi-10 day planetary wave with zonal wavenumber one. The planetary wave activity maximizes in the Antarctic middle atmosphere approximately 30 days before the SSW onset. The quasi-10 day planetary wave abruptly dissipates after the onset of the SSW. Observations from MLS, SABER, and TIDI provide a unique opportunity to study the global structure and evolution of the quasi-10 day waves with both neutral wind and temperature measurements under this unusual atmospheric condition. These space-based measurements are combined with meteor radar wind measurements from Antarctica, providing a comprehensive view of the quasi-10 day wave activity during this SSW. We will present a preliminary analysis of the ionospheric response to these wave perturbations.