The magnetosheath is the region of space surrounding a planet's magnetosphere where the solar wind is significantly compressed and heated as it interacts with the planet's magnetic field. This region is located between the bow shock, where the solar wind first encounters the planet's magnetic field, and the magnetopause, where the planet's magnetic field repels the solar wind. Studying the magnetosheath helps scientists understand the dynamics of space weather and the interactions between planetary magnetic fields and the solar wind.