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Geomagnetic index · G1–G5

NOAA G-Scale (Geomagnetic Storms)

NOAA's five-level scale for the severity of geomagnetic storms, from G1 (minor) to G5 (extreme), describing the expected effects on power grids, satellites, and navigation.

Knowledge connections

Sources

The primary and reference sources this topic draws on.

  • NOAA Solar CalculatorNOAA Global Monitoring Laboratory

    Public-domain solar-position geometry: sunrise, sunset, solar noon, twilight, declination, and the equation of time.

    Public domain (US Government work).