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Geomagnetic storm

A geomagnetic storm is a temporary disturbance of the Earth's magnetosphere.

Associated with solar coronal mass ejections, 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.

Note: This article excerpts material from the Wikipedia article "Geomagnetic storm", which is released under the GNU Free Documentation License.

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