We conduct research on the characterization, understanding, and prediction of the key elements of space environmental disturbances. These include coronal mass ejections, high-speed solar wind streams, solar energetic particle events, and geomagnetic storms. Current research emphasizes particle acceleration and propagation from the Sun to 1 AU, solar and interplanetary sources of transient and recurrent geomagnetic storms, and periodicities (e.g., semiannual, 22 year) in geomagnetic activity. This work is based on various kinds of ground- and space-based data. We welcome proposals on interdisciplinary efforts that cross boundaries of the Sun, solar wind, and magnetosphere.