You searched for: “geomagnetic storms”
geomagnetic storm (s) (noun), geomagnetic storms (pl)
A world-wide disruption of the Earth's magnetic field, distinct from regular diurnal variations: A geomagnetic storm is caused by ionic disturbances from solar events.
This entry is located in the following units: geo-, ge- + (page 14) magnet-, magneto- + (page 1)