Forecast right now

Kp Index

The Kp number is a system of measuring aurora strength. The range goes from 0 to 9 (0 being calm, 1 very weak, all the way up to 9, which would represent a major geomagnetic storm with strong auroras visible). Anything Kp 5 and above is classified as a geomagnetic storm.

source www.swpc.noaa.gov