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Uploaded on Oct 2, 2011
DOUBLE ERUPTION: On October 1st around 10:17 UT, widely-spaced sunspots 1302 and 1305 erupted in quick succession, revealing a long-distance entanglement which was not obvious before. NASA's Solar Dynamics Observatory (SDO) recorded the double blast:
The part of the eruption centered on sunspot 1305 hurled a coronal mass ejection toward Earth. The relatively slow-moving (500 km/s) cloud is expected to reach our planet on Oct. 4th, possibly causing geomagnetic storms when it arrives. High-latitude sky watchers should be alert for auroras.