Aurora Calculator

3-Day Kp Index Forecast

Predicted geomagnetic activity for the next 72 hours, based on NOAA SWPC data.

Peak Forecast Kp
1.67
Wed, 28 Oct 2026 06:00:00 GMT
Storm Periods
1
Geomagnetic storm expected
Data Points
81
3-hour intervals

Kp Index Timeline

03G179Oct 20Oct 21Oct 22Oct 23Oct 24Oct 25Oct 26Oct 27Oct 28Oct 29Oct 30■ Observed■ Estimated■ Predicted

How to Read This Forecast

The Kp index measures geomagnetic activity on a scale from 0 to 9. Higher values mean the auroral oval expands toward the equator, so the aurora becomes visible from lower latitudes. A Kp of 5 or above is classified as a geomagnetic storm (G1 and up).

Bars on the chart are shaded by status: solid bars are observed values, lighter bars are estimated, and the faintest bars are predictions. The orange dashed line marks the G1 storm threshold.

Source: NOAA SWPC · Updated every 3 hours