geomagnetic storm

Alternative definitions (1), class: vernacular (0)
Term: geomagnetic storm

(1) A worldwide disturbance of the Earth’s magnetic field, distinct from regular diurnal variations. A storm is precisely defined as occurring when the daily Ap index exceeds 29, or (2)  NOAA Space Weather Scale (G) for geomagnetic storm disturbances (see Appendix A).

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan