Magnetic storm chart

The interactive chart plots the planetary Kp index over time. Observations arrive from NOAA SWPC's planetary-k-index service; the forecast comes from the official 3-day bulletin. The X axis is time, the Y axis is Kp from 0 to 9, with G1–G5 zones shaded in colour: green — quiet, yellow — G2, orange — G3, red — G4, violet — G5.

Four time ranges are available: 24 hours (hourly detail), 3 days (the standard NOAA retrospective window), 7 days (weekly dynamics) and 30 days (monthly trend with storm peaks). A peak above Kp = 5 is a magnetic storm, above 7 is strong, above 8 is severe.

Kp is a global index — the same everywhere on Earth — because it is integrated from 13 magnetic observatories in sub-auroral latitudes worldwide. For a localised view open the By city section and pick your city: local time and geomagnetic latitude are factored in.