Geomagnetic storm

Definition
Geomagnetic storms

"can induce geo-electric fields in the Earth's crust, driving electric currents in long conductors on or near the Earth's surface. These induced geo-electric fields present a risk to the reliable operation of electric power systems and may affect gas and oil pipelines, railways, and other infrastructures that have long conductive paths. . . . Depending on the severity of the geomagnetic storm, cascading system failure or damage could lead to regional interruptions of electrical power distribution and result in complications with recovery and restoration efforts."