Abstract
The Lower Thermosphere Coupling Study (LTCS) is a coordinated investigation of the lower thermosphere (90–150 km) combining observational (optical and radar) and numerical modeling efforts with the ultimate goal of better understanding the dynamic and electrodynamic processes coupling the mesosphere, lower thermosphere, and upper thermosphere regions. The study, which is being conducted under the auspices of the National Science Foundation CEDAR (Coupling, Energetics, and Dynamics of Atmospheric Regions) Program, is intended to address such questions as, What is the relative importance of upward propagating tides, planetary waves, and gravity waves, related accelerations of the mean flow, and heating and momentum sources of magnetospheric origin, in determining neutral dynamical fields and ionospheric structures as a function of height between 90 and 150 km? How do these different spatial and temporal scales of motion interact with each other, and how do they influence the vertical, seasonal‐latitudinal, and diurnal variations in turbulent diffusivity and transport of minor chemical constituents? What are the relative roles of magnetospheric currents and the ionospheric wind dynamo in determining ionospheric electric fields?
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