ELECTRON RINGS. “These relativistic electron fluxes show sharp dropouts and enhancements in response to the varying geomagnetic activity, and their dynamics is key to space weather, as these electrons pose a hazard to satellites in Earth orbit. Their rapid drift motion around the Earth is largely controlled by the magnetic field geometry, in contrast to the cold particles that are guided both by the electric and magnetic fields.”
https://link.springer.com/article/10.12942/lrsp-2007-1