synchrotron radiation

Synchrotron radiation (also known as magnetobremsstrahlung) is the electromagnetic radiation emitted when relativistic charged particles are subject to an acceleration perpendicular to their velocity (a ⊥ v). It is produced artificially in some types of particle accelerators or naturally by fast electrons moving through magnetic fields. The radiation produced in this way has a characteristic polarization, and the frequencies generated can range over a large portion of the electromagnetic spectrum.

Pictorial representation of the radiation emission process by a source moving around a Schwarzschild black hole in a de Sitter universe. Electromagnetic field observed far from the source (in arbitrary unit) of a positive accelerated point charge. When the velocity increases, the radiation concentrates along the trajectory. This field can be calculated using Liénard–Wiechert potential.