Space weather is an emerging field of space science that deals with the interaction between the Sun and the Earth. The course examines the properties of the Sun as a star with a view to understanding the energy it releases and how it impacts on the Sun-Earth environment, the Earth-space environment and the Earth's upper atmosphere. It also addresses the technological and biological effects of space storms and the dangers for space travel. The focus then shifts to the terrestrial atmosphere. Topics include: hydrostatic balance and the vertical structure of the atmosphere; altimetry; thermodynamics of dry and moist air; the aerological diagram; stability and conditional stability; cloud base and tops; pressure systems and winds; geostrophic, gradient and ageostrophic balance; the global circulation, synoptic-scale weather systems, air masses and fronts, and local winds.