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Aurorae on October 30th, 2003

After one of the most powerful solar eruptions ever recorded by SOHO since it was brought into service in 1976, an extremely powerful geomagnetic storm was triggered. A series of coronal mass ejections (the largest of them being an X-17 flare) near sunspots 448 and 468, the largest within 13 years, caused radio and power blackouts. Satellites were shut down.The particle front had arrived only 19 hours later, one day earlier than usual, and caused widespread and very bright aurorae in Middle Europe in the following two nights. At Trier, it had been cloudy and even been raining heavily on October 29th, 2003, but the second day, the aurorae could easily be spotted. At 21:40, a green glow brightened the northern horizon and quickly got stronger, shining through the cloud holes. At  22:15, red auroral rays appeared, accompanied by yellowish or greenish veils near the horizon, with whitish rays wandering through them. Despite the latitude of 49.8°, the aurorae were so bright they could easily penetrate thin clouds and even appeared overhead. At 22:45, the aurorae got fainter and the clouds began to cover the whole sky.


Composite of two frames manually stacked with Adobe Photoshop Elements. Fuji Finepix S2 Pro digital SLR, 30 seconds at 200 ISO.

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