 As with Earth's magnetosphere, the boundary separating the denser and colder solar wind's plasma from the hotter and less dense one within Jupiter's magnetosphere is called the magnetopause.The distance from the magnetopause to the center of the planet is from 45 to 100 "R"J (where "R"J=71,492 km is the radius of Jupiter) at the subsolar point—the unfixed point on the surface at which the Sun would appear directly overhead to an observer.The position of the magnetopause depends on the pressure exerted by the solar wind, which in turn depends on solar activity.