https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.7 2026-04-15T10:53:30.610Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/e453077b-b6f3-44f0-9f3d-4408bf9a69e5 MAGNETIC STORMS A magnetic storm is a large-scale disturbance of the magnetosphere, ofteninitiated by the arrival of an interplanetary shock originating at the Sun. Amagnetic storm is marked by the injection of an appreciable number of ions fromthe magnetotail into the ring current, a process accompanied by increasedauroral displays. The strengthened ring current causes a world-wide drop in theequatorial magnetic field, taking perhaps 12 hours to reach its greatestintensity, followed by a more gradual recovery.