The National Science Foundation (NSF) Geospace Environment Modeling (GEM) program is now in its fifth year. Each of its active and planned campaigns is aimed at understanding and describing the physics of a particular region of geospace. They collect and analyze ground- and space-based measurements relevant to their region and develop, test, and refine quantitative physical or empirical models of their respective regions. The campaigns interact with the Geospace General Circulation Model (GGCM) campaign, which is synthesizing the various models into a single global one.
