Terdiurnal atmospheric tides seen with ICON at E- and F-region altitudes

Global-scale waves known as atmospheric tides and planetary waves are commonly observed at altitudes just below the ionosphere. Until recently, routine observations of the winds across a wide range of altitudes was scarce at ionospheric altitudes. Recent wind observations from ICON that span the E- and F-regions offer an opportunity to examine the global scale waves that are present, and ultimately determine their impacts on the ionosphere. This work utilizes these wind observations at both E- and F-region ionospheric altitudes to identify which tides are present at each altitude. Specifically, this work will examine the terdiurnal tides that are present, and compare these to the better-studied diurnal and semidiurnal tides. Changes with season, altitude and interannual variability will be presented.