February 19: Activity expected to decrease. Nevertheless, decent aurora activity is likely tonight. Clouds will block the view in most locations except in north Iceland. Check real time data regularly and watch for the aurora on-switch, Bz south under Bz value.
When the Bz value points south, aurora is active. Faster solar wind expands the auroral oval. Higher density leads to more colourful displays.
Record of measurements at Leirvogur for the past 6 hours.
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The chart shows 3 day forecast of the Kp-index with hourly interval
The chart shows the largest daily Kp-index value
