September 13: Decent Northern Lights likely tonight. Activity should increase due to influence of a coronal hole. Openings in the cloud cover predicted in Reykjanes peninsula and west Iceland. Best viewing times from 11 pm to 03:00 am. Watch for negative Bz (south) under real time space weather data. When negative, aurora can get bright even if activity is low.
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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