Gyromagnetic emission is also produced from the kinetic energy of a charge particle, generally an electron. However in this case, an external magnetic field causes the particle's trajectory to exhibit a spiral gyromotion, resulting in a centripetal acceleration that in turn produces the electromagnetic waves. Different terminology is used for the same basic phenomenon depending on how fast the particle is spiraling around the magnetic field, which is due to the different mathematics required to describe the physics. Gyroresonance emission refers to slower, non- relativistic speeds and is also called magneto-bremsstrahlung or cyclotron emission. Gyrosynchrotron corresponds to the mildly relativistic case, where the particles rotate at a small but significant fraction of light speed, and synchrotron emission refers to the relativistic case where the speeds approach that of light.