The Earth's magnetosphere can be significantly affected by transient solar wind features (both intrinsic features such as structures in the solar wind and locally generated phenomena such as hot flow anomalies near the bow shock). Important energy transfer and transport will occur during the interaction of transient solar wind features with the Geospace system. Solar energy in various forms can propagate into the magnetosphere and ionosphere. Charged particle energy can be transformed to electromagnetic energy and vice versa. In-depth understanding of how the magnetosphere respond to transient solar wind features will enhance our knowledge on the solar wind - magnetosphere –ionosphere coupling.

This special session will provide a forum to present the latest results from in-situ spacecraft observations (e.g., NASA MMS, Van Ellen Probes, THEMIS, ESA Cluster, etc), ground-based observations (all-sky camera, radar, magnetometer), and global simulations. Coordinated multi-point observations are especially encouraged.