This refers to beautiful phenomena like auroral lights. But there may be dangerous consequences like power grid failures, as well. One example in this context are extragalactic jets. In jets there are plasma flows over distances of more than 100.000 light years with velocities near to the velocity of light which are driven by rotating black holes. A further point of our scientific interests refers to pulsars.
Pulsars are the result of supernovae explosions.
These are the strongest existing magnetic fields at all. Pulsars show coherent radio emissions and powerful X-ray emissions. Es gibt kein M1crab.