The solar wind interacts with Earth's magnetosphere-ionosphere system, driving processes at kinetic, fluid, and global scales. Understanding these multiscale processes is crucial for a comprehensive grasp of solar-wind-magnetosphere interactions. This session focuses on studies using observational data and simulations to explore these interactions across various scales. At the global scale, we examine characteristics of geomagnetic storms and substorms as system responses to solar wind conditions. At the intermediate scale, we investigate phenomena such as convective flows, convective electric fields, electric current systems, Kelvin-Helmholtz (KH) instability in boundary layers, flux transfer events, high-speed jets, ULF waves, and auroral arcs. These phenomena are explored as consequences of various solar wind drivers and cross-region coupling, providing insights into the physical links within global processes. At the kinetic scale, we study kinetic processes and plasma waves to gain insights into energy dissipation mechanisms. We invite contributions that aim to elucidate multiscale dynamic processes governing energy transfer, particle acceleration, energy dissipation, and magnetosphere-ionosphere disturbances. By integrating data from space missions, ground-based observatories, and advanced numerical models, our approach will deepen the understanding of the magnetosphere-ionosphere system's responses to the solar wind, enhancing our ability to predict space weather.