The Sun-Earth Connections program is comprised of several spacecraft measuring the hot, high-speed plasmas flowing past the Earth from the expanding solar corona. There is a large constellation of spacecraft within the Earth's magnetosphere examining many aspects of the plasmas that change as the sun disturbs the geospace environment. There is also an international web of ground stations that is recording the magnetospheric and ionospheric signatures of the interaction of the variable sun with the terrestrial environment. This program has greatly expanded our knowledge of Sun-Earth Relationships and continues to reveal the nature of the sun, the interplanetary medium, and the magnetosphere-ionosphere system. Daniel N.Baker, William Peterson, Scot Elkington, and Xinlin Li are actively working on data and modeling in the program.
