From Wikipedia:
A geomagnetic storm, or solar storm, is a temporary disturbance of the Earth’s magnetospherespace weather. Associated with solar coronal mass ejections (CME), coronal holes, or solar flares, a geomagnetic storm is caused by a solar wind shock wave which typically strikes the Earth’s magnetic field 24 to 36 hours after the event.
This guy has a lot of awesome images. Make the jump for a few more.
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