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Elevated Geomagnetic Field Activity Expected - 21-24 April 2017
An enhancement in the near-earth solar wind environment caused periods of G1 (Minor) geomagnetic storm conditions between 21/1800-2359 UTC. The solar wind is expected to become further enhanced due to the anticipated onset of a negative polarity coronal hole (high speed solar wind stream) which is expected to cause additional periods of G1 (Minor) storm levels on 22-24 April with G2 (Moderate) storm levels likely on 23 April.