The effects of climate change on the Earth’s atmosphere, both as a result of human activity and natural variations in the geomagnetic field, are of growing interest in climate studies. Furthermore, space weather events (such as sporadic-E layers) can modulate satellite navigation systems and radio communications, which are important to a variety of professions. However, the long-term climate impacts on such space weather events are not well-studied. This PhD therefore involves using TIE-GCM and WACCM-X to look at long-term climate impacts and trends on the structure of the thermosphere-ionosphere system at high latitudes, as well as an investigation into climate change on space weather events.