Reference Terms
from Wikipedia, the free encyclopedia

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:   The above text is excerpted from the Wikipedia article "Geomagnetic storm", which has been released under the GNU Free Documentation License.
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September 2, 2015

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