How do Jupiter’s strong magnetic fields trap charged particles around the planet?

Jupiter has the largest and strongest planetary magnetosphere in the Solar System. Deep inside the planet, pressure is so extreme that hydrogen acts like a metal and helps generate a powerful magnetic field through dynamo action. That field traps particles from the solar wind and from volcanic material coming from Io, creating harsh radiation belts around the planet. Spacecraft near Jupiter must be built to withstand that environment, because the radiation is far stronger than around Earth.