Deducing non-migrating diurnal tides in the middle thermosphere with GOLD observations of the Earth's far ultraviolet dayglow from geostationary orbit

Since GOLD only measures these quantities during daylight, and only over the similar to 140 degrees of longitude visible from geostationary orbit, previously developed tidal analysis techniques cannot be applied to the GOLD data set.

This paper presents a novel approach that deduces two specified non-migrating diurnal tides using simultaneous measurements of temperature and sigma O/N-2. DE3 (diurnal eastward propagating wave 3) and DE2 (diurnal eastward propagating wave 2) during October 2018 and January 2020 are the focus of this paper. Sensitivity analyses using TIE-GCM simulations reveal that our approach reliably retrieves the true phases, whereas a combination of residual contributions from secondary tides, the restriction in longitude, and random uncertainty can lead to similar to 50% error in the retrieved amplitudes.