GOLD Synoptic Observations of Quasi?6?Day Wave Modulations of Post?Sunset Equatorial Ionization Anomaly During the September 2019 Antarctic Sudden Stratospheric Warming

Using observations from the Global-scale Observations of Limb and Disk (GOLD) mission, we investigate post-sunset ionospheric responses to September 2019 Antarctic sudden stratospheric warming –first ever a synoptic perspective. reveal prevalent quasi-6-day periodicity in equatorial ionization anomaly region over South America Atlantic, coincident with enhanced wave (Q6DW) activity mesosphere (Liu et al., 2021, https://doi.org/10.1029/2020JA028909). The atmosphere-ionosphere coupling via large-scale waves is rarely studied ocean due lack observations. More importantly, further analyses suggest that multiple pathways are involved transmitting middle atmosphere into F-region ionosphere, including modulation field aligned winds pre-reversal enhancements by tides or Q6DW. A remarkable depletion electron density, attributable overall change thermosphere composition driven dissipative Q6DWs, also seen during period Q6DW activity.