Solar-Terrestrial Interactions

: This report covers a basic research (6.1 level) task on solar-terrestrial interactions carried out in the Space Weather Center of Excellence over an 11-year period for the Air Force Office of Scientific Research. This includes work on characterizing and predicting solar activity as characterized by sunspot numbers, the occurrence of solar coronal mass ejections (CMEs), energetic (1 MeV < E < 1 GeV) particle events, the solar wind, and geomagnetic storms. The investigators, working at Hanscom AFB, MA, have used many different kinds of space- and ground-based observations and have collaborated with workers at various institutions in this work. The task annual summaries are given and preceded by synopses of highlighted work for each year's report and followed by a complete listing of the publications funded by the task.